"Practical sciences proceed by building up; theoretical..." - Quote by Thomas Aquinas

“If the highest aim of a captain were to preserve his ship, he would keep it in port forever.”

“Better to illuminate than merely to shine.”

“Man should not consider his material possession his own, but as common to all, so as to share them without hesitation when others are in need.”

“Everything in science depends on what one calls an aperçu, on becoming aware of what is at the bottom of the phenomena. Such becoming aware is infinitely fertile.”

“No human investigation can claim to be scientific if it doesn't pass the test of mathematical proof.”

“The chief forms of beauty are order and symmetry and definiteness, which the mathematical sciences demonstrate in a special degree.”

“Look somewhere else for someone who can follow you in your researches about numbers. For my part, I confess that they are far beyond me, and I am competent only to admire them.”

“Philosophy is the true mother of science.”

“I don't know anything about this man. Anyhow, I only know two things about him. One is, he has never been in jail, and the other is, I don't know why.”