Two radical ideas have been introduced into human thought....

Two radical ideas have been introduced into human thought. One of them is that energy and matter are pretty much the same sort of stuff. That's Einstein. The other is that revenge is a bad idea. Revenge is an enormously popular idea but, of course, Jesus came along with the radical idea of forgiveness. If you're insulted, you have to square accounts. So this invention by Jesus is as radical as Einstein's.