I can’t tell you how much pride I took in that moment, the same syrupy pride I take when sitting on a subway car where no two faces, no two histories, seem alike, and feeling nothing but minding-our-own-business good will I felt the same watching all our children in the park, knowing that they must recognize difference but see nothing in it to fear. How great it must be, I thought, to grow up in that America, a place still flawed but striving to do better.

I understood that, in my 40s, I was already part of history. That certain things I knew didn’t need to be known anymore.

And yet, in seven months of this presidency, in one single day in Charlottesville, Va., all of that is lost. A generation, and so much more, stolen away. There is the trauma of those assaulted by Nazis on American soil and the tragedy that is Heather Heyer’s murder that belongs to her and her family alone. And then there is what all the rest of us share — the pain and violence and the lessons we draw from them. Because the children who witness a day like that, and a president like this, will not forget the fear and disrespect tailored to the black child, the Muslim child, the Jewish child.

They will not forget the assault rifles that this government puts in these violent men’s hands, nor the chants that black lives don’t matter and that the Jews will not replace them — just as I will never not hear what that kid on the bike screamed or stop seeing my father helping a boy, crawling for pennies, off his knees.

While harking back to my pious, head-covered days, I am reminded of a notion that our rabbis taught us: The theft of time is a crime like any other. Back then it was about interrupting class — one minute wasted was a minute of learning lost. But multiply that minute by everyone in the room, and it became 15, 20 minutes, half an hour’s worth of knowledge that none of us could ever get back.

Saturday in Charlottesville was just one day, but think of that one day multiplied by all of us, across this great country. Think of the size of that setback, the assault on empathy, the divisiveness and tiki-torched terror multiplied by every single citizen of this nation. It may as well be millions of years of dignity, of civility, of progress lost.

Just from that one day.