The measure of intelligence is the ability to change.

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

Those who cannot change their minds cannot change anything.

He who joyfully marches to music in rank and file has already earned my contempt. He has been given a large brain by mistake, since for him the spinal cord would surely suffice.

Despite my firm convictions, I have been always a man who tries to face facts, and to accept the reality of life as new experience and new knowledge unfolds it. I have always kept an open mind, which is necessary to the flexibility that must go hand in hand with every form of intelligent search for truth.

To be evenminded
is the greatest virtue.
Wisdom is to speak
the truth and act
in keeping with its nature.