Some of my favourites
The difference between stupidity and genius is that genius has its limits.
We cannot solve our problems with the same thinking we used when we created them.
It has become appallingly obvious that our technology has exceeded our humanity.
Insanity: doing the same thing over and over again and expecting different results.
Only two things are infinite, the universe and human stupidity, and I’m not sure about the former.
Only a life lived for others is a life worthwhile.
The only source of knowledge is experience.
If you can’t explain it simply, you don’t understand it well enough.
The only reason for time is so that everything doesn’t happen at once.