It is a bewildering thing in human life that the things that cause the greatest fear is the source of the greatest wisdom.

Once upon a time men were possessed by devils. Now they are not less obsessed by ideas

Everything good is costly, and the development of personality is one of the most costly of all things. It is a matter of saying yes to oneself, of taking oneself as the most serious of tasks, of being conscious of everything one does, and keeping it constantly before one's eyes in all its dubious aspects.

Thinking is difficult, that’s why most people judge.

The growth of the mind is the widening of the range of consciousness, and each step forward has been a most painful and laborious achievement.

An understanding heart is everything in a teacher, and cannot be esteemed highly enough.

Madness is a special form of the spirit and clings to all teachings and philosophies, but even more to daily life, since life itself is full of craziness and at bottom utterly illogical. Man strives toward reason only so that he can make rules for himself.