Evil being the root of mystery, pain is the root of knowledge.

I can, therefore I am.

Even if our efforts of attention seem for years to be producing no result, one day a light that is in exact proportion to them will flood the soul.

The payment of debts is necessary for social order. The non-payment is quite equally necessary for social order. For centuries humanity has oscillated, serenely unaware, between these two contradictory necessities.

Our science is like a store filled with the most subtle intellectual devices for solving the most complex problems, and yet we are almost incapable of applying the elementary principles of rational thought.

To claim that theft or adultery or lying are "evil" simply reflects our degraded idea of good-—that it has something to do with respect for property, respectability, and sincerity.

The lure of quantity is the most dangerous of all.