Truth will not make us rich, but it will make us free.
Every science begins as philosophy and ends as art; it arises in hypothesis and flows into achievement.
In the last analysis civilization is based upon the food supply.
Civilizations come and go; they conquer the earth and crumble into dust; but faith survives every desolation.
The great snare of thought is uncritical acceptance of irrational assumptions.
It came to me that reform should begin at home, and since that day I have not had time to remake the world.