The point of philosophy is to start with something so simple as not to seem worth stating and to end with something so paradoxical that no one will believe it.
In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.
The most essential characteristic of scientific technique is that it proceeds from experiment, not from tradition.
Curious learning not only makes unpleasant things less unpleasant, but also make pleasant things more pleasant.
Men are born ignorant, not stupid. They are made stupid by education.
Science is what you know, philosophy is what you don't know.
Of all forms of caution, caution in love is perhaps the most fatal to true happiness.
There are two motives for reading a book: one, that you enjoy it; the other, that you can boast about it.
War does not determine who is right - only who is left.
To fear love is to fear life, and those who fear life are already three parts dead.