If an opinion contrary to your own makes you angry, that is a sign that you are subsciously aware of having no good reason for thinking as you do. [...] The most savage controversies are those about matters as to which there is no good evidence either way. Persecution is used in theology, not in arithmetic, because in arithmetic there is knowledge, but in theology there is only opinion. So whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants.

With equal passion I have sought knowledge. I have wished to understand the hearts of men. I have wished to know why the stars shine. And I have tried to apprehend the Pythagorean power by which number holds sway about the flux. A little of this, but not much, I have achieved.

With subjectivity in philosophy, anarchism in politics goes hand in hand. Already during Luther's lifetime, unwelcome and unacknowledged disciples had developed the doctrine of Anabaptism, which for a time dominated the city of Munster. The Anabaptists repudiated all law since they held that good men will be guided at every moment by the Holy Spirit, who can not be bound by formulas. From this premise they arrive at communism and sexual promiscuity; they were therefore exterminated after a heroic resistance.

True happiness for human beings is possible only to those who develop their godlike potentialities to the utmost.

Fear is the parent of cruelty, and therefore it is no wonder if cruelty and religion go hand in hand.

Folly is perennial and yet the human race has survived.

Many a marriage hardly differs from prostitution, except being harder to escape from.