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.
Curious learning not only makes unpleasant things less unpleasant, but also make pleasant things more pleasant.
The most essential characteristic of scientific technique is that it proceeds from experiment, not from tradition.
Science is what you know, philosophy is what you don't know.
To fear love is to fear life, and those who fear life are already three parts dead.
Men are born ignorant, not stupid. They are made stupid by education.
War does not determine who is right - only who is left.
There are two motives for reading a book: one, that you enjoy it; the other, that you can boast about it.
Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.
Of all forms of caution, caution in love is perhaps the most fatal to true happiness.