If we are going to go with witty quotes talking about older lessons that people reject, I am rather fond of https://en.wikipedia.org/wiki/Greenspun%27s_tenth_ru

If we are going to go with witty quotes talking about older lessons that people reject, I am rather fond of https://en.wikipedia.org/wiki/Greenspun%27s_tenth_rule https://en.wikipedia.org/wiki/Greenspun%27s_tenth_rule. I'm a little worried this encourages ignoring things that have been learned recently. But it is very hard to not be annoyed when you realize how much ground was covered early on.