The first test of a truly great man is his humility. By humility I don't mean doubt of his powers or hesitation in speaking his opinion, but merely an understanding of the relationship of what he can say and what he can do.

There is no wealth but life.

Large fortunes are all founded either on the occupation of land, or lending or the taxation of labor.

Whereas it has long been known and declared that the poor have no right to the property of the rich, I wish it also to be known and declared that the rich have no right to the property of the poor.

Traditional scientific method has always been at the very best, 20 - 20 hindsight. It's good for seeing where you've been. It's good for testing the truth of what you think you know, but it can't tell you where you ought to go.

It's obviously unfair to paint with a broad brush here, but the germ of an idea for a breakthrough in technology doesn't come out of a business school curriculum. It comes out of a laboratory or a math lecture or a physics tutorial.

The mineral world is a much more supple and mobile world than could be imagined by the science of the ancients. Vaguely analogous to the metamorphoses of living creatures, there occurs in the most solid rocks, as we now know, perpetual transformation of a mineral species.

Arresting development, attacking science, and glorifying poverty is not the answer to the vices that attend prosperity.