Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
Prediction is very difficult, especially if it’s about the future.
A day without laughter is a day wasted.
An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.
Intelligence is the ability to adapt to change.
If you can’t explain it simply, you don’t understand it well enough
Las ideas no duran mucho. Hay que hacer algo con ellas.
Santiago Ramón y Cajal