VATICAN CITY (Reuters) - Men with deep-rooted homosexual tendencies should not be admitted to the Catholic clergy, and it would be better for priests who are actively gay to leave rather than lead a double life, Pope Francis says in a new book.

While he has previously spoken of the need for better screening of candidates for the religious life, his comments suggesting that priests who cannot keep their vows of celibacy should leave are some of his clearest to date.

Francis made the comments in a book-length interview with Spanish priest Fernando Prado called “The Strength of Vocation”, in which he discusses the challenges of being a priest or nun today.

Francis said in the book that homosexuality in the Church “is something that worries me”. It is due to be published this week in several languages. An advance copy of the Italian version was made available to Reuters.

“The question of homosexuality is a very serious one,” he said, adding that those entrusted with training men to be priests must be certain that candidates are “humanly and emotionally mature” before they can be ordained.

This also applied to women who wanted to enter female religious communities to become nuns. In the Catholic Church, priests, nuns and monks all take vows of celibacy.

The Church teaches that homosexual tendencies are not sinful in themselves, but homosexual acts are.

Francis said there was “no room for this” in the lives of priests and nuns, adding that the Church had to be “demanding” in choosing candidates for what is known as the consecrated life.

“For this reason, the Church urges that persons with this rooted tendency not be accepted into (priestly) ministry or consecrated life,” he said.

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“BETTER TO LEAVE”

He urged homosexuals who are already priests or nuns to be celibate and responsible to avoid creating scandal. “It is better that they leave the priesthood or the consecrated life rather than live a double life,” he said.

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The interview was conducted in mid-August. Less than two weeks later, on Aug. 26, Archbishop Carlo Maria Vigano, the Vatican’s former ambassador to the Vatican, threw the Church into turmoil with a bombshell statement against the pope and Vatican officials.

Vigano said a “homosexual network” existed in the Vatican, whose members helped promote each other’s careers in the Church.

He also accused the pope of having ignored alleged sexual misconduct with adult male seminarians by former American cardinal Theodore McCarrick, 88.

The Vatican said Vigano’s accusations were riddled with “calumny and defamation”.

The Catholic Church has been haunted for more than two decades by evidence of thousands of cases of sexual abuse of minors by clergy around the world, in countries ranging from the United States to Australia, Ireland, Belgium, Germany and Chile.

In July, McCarrick became the first cardinal to resign in nearly 100 years after U.S. Church officials said allegations made in a separate investigation that he had sexually abused a 16-year-old boy almost 50 years ago were credible and substantiated.

McCarrick has said he had no recollection of the alleged abuse of the minor, but has not commented on the allegations of misconduct with the seminarians, which allegedly took place decades ago.