Quotation Collection

To have doubted one's own first principles is the mark of a civilized man. Oliver Wendell Holmes

• principle
• doubt

A good stack of examples, as large as possible, is indispensable for a thorough understanding of any concept, and when I want to learn something new, I make it my first job to build one. Paul Halmos

• science
• education

Next time you're in a debate, ask yourself if someone is on offense or defense. If they're neither, then you know you have someone you can learn from. Julien Smith

• argument

I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do. Robert Heinlein

• freedom
• morals