(CNN) NFL legend Mike Ditka was giving a news conference one day after being fired as the coach of the Chicago Bears when he decided to quote the Bible.

"Scripture tells you that all things shall pass," a choked-up Ditka said after leading his team to only five wins during the previous season. "This, too, shall pass."

Ditka fumbled his biblical citation, though. The phrase "This, too, shall pass" doesn't appear in the Bible. Ditka was quoting a phantom scripture that sounds like it belongs in the Bible, but look closer and it's not there.

Ditka's biblical blunder is as common as preachers delivering long-winded public prayers. The Bible may be the most revered book in America, but it's also one of the most misquoted. Politicians, motivational speakers, coaches - all types of people - quote passages that actually have no place in the Bible, religious scholars say.

These phantom passages include:

"God helps those who help themselves."

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"Spare the rod, spoil the child."

And there is this often-cited paraphrase: Satan tempted Eve to eat the forbidden apple in the Garden of Eden.

None of those passages appear in the Bible, and one is actually anti-biblical, scholars say.

But people rarely challenge them because biblical ignorance is so pervasive that it even reaches groups of people who should know better, says Steve Bouma-Prediger, a religion professor at Hope College in Holland, Michigan.

"In my college religion classes, I sometimes quote 2 Hesitations 4:3 ('There are no internal combustion engines in heaven')," Bouma-Prediger says. "I wait to see if anyone realizes that there is no such book in the Bible and therefore no such verse.

"Only a few catch on."

Few catch on because they don't want to - people prefer knowing biblical passages that reinforce their pre-existing beliefs, a Bible professor says.

"Most people who profess a deep love of the Bible have never actually read the book," says Rabbi Rami Shapiro, who once had to persuade a student in his Bible class at Middle Tennessee State University that the saying "this dog won't hunt" doesn't appear in the Book of Proverbs.

"They have memorized parts of texts that they can string together to prove the biblical basis for whatever it is they believe in," he says, "but they ignore the vast majority of the text."

Phantom biblical passages work in mysterious ways

Ignorance isn't the only cause for phantom Bible verses. Confusion is another.

Some of the most popular faux verses are pithy paraphrases of biblical concepts or bits of folk wisdom.

Consider these two:

"God works in mysterious ways."

"Cleanliness is next to Godliness."

Both sound as if they are taken from the Bible, but they're not. The first is a paraphrase of a 19th century hymn by the English poet William Cowper ("God moves in a mysterious way, His wonders to perform).

The "cleanliness" passage was coined by John Wesley, the 18th century evangelist who founded Methodism, says Thomas Kidd, a history professor at Baylor University in Texas.

"No matter if John Wesley or someone else came up with a wise saying - if it sounds proverbish, people figure it must come from the Bible," Kidd says.

Our fondness for the short and tweet-worthy may also explain our fondness for phantom biblical phrases. The pseudo-verses function like theological tweets: They're pithy summarizations of biblical concepts.

Photos: Christianity's revered (and bizarre) relics The blood of Saint Januarius – The vessel held here by Pope Francis is said to contain the dried blood of Saint Januarius. The vial is kept in Italy's Naples Cathedral. It's brought out three times a year for prayer ceremonies, during which it is said to liquefy. However, the blood doesn't always assume its liquid state -- as was the case on December 16, 2016. According to legend, that could foreshadow disaster in the coming year. To learn more about the evidence behind Christian relics, artifacts and the historical Jesus, watch CNN's original series "Finding Jesus," Sunday nights at 9 ET/PT. Hide Caption 1 of 12 Photos: Christianity's revered (and bizarre) relics The tongue of Saint Anthony – Saint Anthony, often invoked by Catholics when they've lost something, is buried at the Basilica of Saint Anthony in Padua, Italy. The church also houses a large reliquary containing his tongue. According to church legend, when Saint Anthony's body was exhumed years after his death, most of his body had turned to dust. His tongue, however, is said to have appeared moist and alive. Hide Caption 2 of 12 Photos: Christianity's revered (and bizarre) relics The bones of Saint Peter – Pope Francis holds a box -- found in a tomb beneath Saint Peter's Basilica in Vatican City -- which the Catholic Church claims contains the bones of Saint Peter. The relics were first discovered in the 1940s, but Pope Francis put them on display to the public for the first time in 2013. Hide Caption 3 of 12 Photos: Christianity's revered (and bizarre) relics The True Cross – Over the years, countless supposed fragments of the cross on which Jesus was crucified have turned up. Historians say the spread of these relics can be traced to Saint Helena, the mother of Emperor Constantine, the first Roman emperor to convert to Christianity. Helena traveled to Jerusalem and while there, excavators working for her discovered three crosses buried beneath a temple. It's claimed that, through a miraculous revelation, Helena was able to discern which of the crosses was the "true cross." She left one piece of it in Jerusalem and took the rest to Europe. Hide Caption 4 of 12 Photos: Christianity's revered (and bizarre) relics The head of Saint Catherine of Siena – Saint Catherine of Siena was known for her miraculous visions and her work helping the sick and poor. Today visitors to the city can see a slightly macabre memorial to her. More than 600 years after her death, Saint Catherine's head remains on display at the Basilica of San Domenico. Hide Caption 5 of 12 Photos: Christianity's revered (and bizarre) relics The Shroud of Turin – The shroud is believed by many Christians to be the burial shroud of Jesus -- but science suggests otherwise . Carbon dating indicates it dates to the 13th or 14th century. The cloth is regarded by the scientifically minded as a medieval forgery. Hide Caption 6 of 12 Photos: Christianity's revered (and bizarre) relics The Veil of Veronica – Legend has it that as Jesus was being led to the hill where he was crucified, Saint Veronica encountered him. She used a cloth to wipe the sweat and blood from his face, and the veil was supposedly imprinted with his image. The existence of the veil has never been proven or disproven -- but there are a number of copies and purported originals scattered across Europe. Hide Caption 7 of 12 Photos: Christianity's revered (and bizarre) relics The crown of thorns – According to the Bible, a crown of thorns was placed on Jesus' head before his crucifixion. Today a number of relics of the crown are venerated by Christians. The one pictured above is held in Paris' Notre Dame Cathedral. Hide Caption 8 of 12 Photos: Christianity's revered (and bizarre) relics The Holy Lance – According to the Gospel of John, a Roman soldier pierced Jesus' side with a spear during his crucifixion. A number of relics purporting to be the tip of this "Holy Lance" have surfaced throughout history. Also known as the "Spear of Destiny" and supposedly bestowing supernatural powers on its owner, there are at least three relics at different locations that claim to be part of the original. Hide Caption 9 of 12 Photos: Christianity's revered (and bizarre) relics The Sudarium of Oviedo – Meaning "sweat cloth" in Latin, the Sudarium of Oviedo is a bloodstained piece of cloth that was allegedly used to wrap the head of Jesus after his crucifixion. Today, the relic is kept in a chest in the Cathedral of San Salvador in Oviedo, Spain. Hide Caption 10 of 12 Photos: Christianity's revered (and bizarre) relics The Sancta Camisia – Chartres is home to one of Europe's most stunning Gothic cathedrals. The church also houses one of Christianity's most venerated relics --The Sancta Camisia. The tunic is said to have been worn by the Virgin Mary during Jesus' birth. Hide Caption 11 of 12 Photos: Christianity's revered (and bizarre) relics The head of John the Baptist – According to the Bible, Herod Antipas ordered John the Baptist's beheading after his step-daughter, Salome, requested it be presented to her on a platter. But what became of John's head? Some claim it's held at the Basilica of Saint Sylvester the First in Rome. Other traditions place it in France or the Middle East. Hide Caption 12 of 12

"Spare the rod, spoil the child" falls into that category. It's a popular verse - and painful for many kids. Could some enterprising kid avoid the rod by pointing out to his mother that it's not in the Bible?

It's doubtful. Her possible retort: The popular saying is a distillation of Proverbs 13:24: "The one who withholds [or spares] the rod is one who hates his son."

Another saying that sounds Bible-worthy: "Pride goes before a fall." But its approximation, Proverbs 16:18, is actually written: "Pride goeth before destruction, and an haughty spirit before a fall."

There are some phantom biblical verses for which no excuse can be offered. The speaker goofed.

That's what Bruce Wells, a theology professor, thinks happened to Ditka, the former NFL coach, when he strayed from the gridiron to biblical commentary during his 1993 press conference in Chicago.

Wells watched Ditka's biblical blunder on local television when he lived in Chicago. After Ditka cited the mysterious passage, reporters scrambled unsuccessfully the next day to find the biblical source.

They should have consulted Wells, who is now director of the ancient studies program at Saint Joseph's University in Pennsylvania. Wells says Ditka's error probably came from a peculiar feature of the King James Bible.

"My hunch on the Ditka quote is that it comes from a quirk of the King James translation," Wells says. "Ancient Hebrew had a particular way of saying things like, 'and the next thing that happened was...' The King James translators of the Old Testament consistently rendered this as 'and it came to pass.' ''

When phantom Bible passages turn dangerous

People may get verses wrong, but they also mangle plenty of well-known biblical stories as well.

Two examples: The scripture never says a whale swallowed Jonah, the Old Testament prophet, nor did any New Testament passages say that three wise men visited baby Jesus, scholars say.

Those details may seem minor, but scholars say one popular phantom Bible story stands above the rest: The Genesis story about the fall of humanity.

Most people know the popular version - Satan in the guise of a serpent tempts Eve to pick the forbidden apple from the Tree of Life. It's been downhill ever since.

But the story in the book of Genesis never places Satan in the Garden of Eden.

"Genesis mentions nothing but a serpent," says Kevin Dunn, chair of the department of religion at Tufts University in Massachusetts.

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"Not only does the text not mention Satan, the very idea of Satan as a devilish tempter postdates the composition of the Garden of Eden story by at least 500 years," Dunn says.

Getting biblical scriptures and stories wrong may not seem significant, but it can become dangerous, one scholar says.

Most people have heard this one: "God helps those that help themselves." It's another phantom scripture that appears nowhere in the Bible, but many people think it does. It's actually attributed to Benjamin Franklin, one of the nation's founding fathers.

The passage is popular in part because it is a reflection of cherished American values: individual liberty and self-reliance, says Sidnie White Crawford, a religious studies scholar at the University of Nebraska.

Yet that passage contradicts the biblical definition of goodness: defining one's worth by what one does for others, like the poor and the outcast, Crawford says.

Crawford cites a scripture from Leviticus that tells people that when they harvest the land, they should leave some "for the poor and the alien" (Leviticus 19:9-10), and another passage from Deuteronomy that declares that people should not be "tight-fisted toward your needy neighbor."

"We often infect the Bible with our own values and morals, not asking what the Bible's values and morals really are," Crawford says.

Where do these phantom passages come from?

It's easy to blame the spread of phantom biblical passages on pervasive biblical illiteracy. But the causes are varied and go back centuries.

Some of the guilty parties are anonymous, lost to history. They are artists and storytellers who over the years embellished biblical stories and passages with their own twists.

If, say, you were an anonymous artist painting the Garden of Eden during the Renaissance, why not portray the serpent as the devil to give some punch to your creation? And if you're a preacher telling a story about Jonah, doesn't it just sound better to say that Jonah was swallowed by a whale, not a "great fish"?

Others blame the spread of phantom Bible passages on King James, or more specifically the declining popularity of the King James translation of the Bible.

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That translation, which marks 400 years of existence this year, had a near monopoly on the Bible market as recently as 50 years ago, says Douglas Jacobsen, a professor of church history and theology at Messiah College in Pennsylvania.

"If you quoted the Bible and got it wrong then, people were more likely to notice because there was only one text," he says. "Today, so many different translations are used that almost no one can tell for sure if something supposedly from the Bible is being quoted accurately or not."

Others blame the spread of phantom biblical verses on Martin Luther, the German monk who ignited the Protestant Reformation, the massive "protest" against the excesses of the Roman Catholic Church that led to the formation of Protestant church denominations.

"It is a great Protestant tradition for anyone - milkmaid, cobbler, or innkeeper - to be able to pick up the Bible and read for herself. No need for a highly trained scholar or cleric to walk a lay person through the text," says Craig Hazen, director of the Christian Apologetics program at Biola University in Southern California.

But often the milkmaid, the cobbler - and the NFL coach - start creating biblical passages without the guidance of biblical experts, he says.

"You can see this manifest today in living room Bible studies across North America where lovely Christian people, with no training whatsoever, drink decaf, eat brownies and ask each other, 'What does this text mean to you?''' Hazen says.

"Not only do they get the interpretation wrong, but very often end up quoting verses that really aren't there."