Those who don't know history are doomed to repeat it.

Those who forget the past are doomed to repeat it

He who doesn't understand history is doomed to repeat it.

Those unable to catalog the past are doomed to repeat it.

We're doomed to repeat the past no matter what. That's what it is to be alive. It's pretty dense kids who haven't figured that out by the time they're ten.... Most kids can't afford to go to Harvard and be misinformed.

Example is the school of mankind, and they will learn at no other.