Until this moment, I never understood how hard it was to lose something you never had.

Wisdom is not a product of schooling but of the lifelong attempt to acquire it.

It is not that I'm so smart. But I stay with the questions much longer.

Great spirits have always encountered opposition from mediocre minds. The mediocre mind is incapable of understanding the man who refuses to bow blindly to conventional prejudices and chooses instead to express his opinions courageously and honestly.

Any fool can know. The point is to understand.

The measure of intelligence is the ability to change.