People are zealous for a cause when they are not quite positive that it is true.

Philosophy is an unusually ingenious attempt to think fallaciously.

The evolution of our spirit is blazed on the dark background of eternity by our individual wakes. Every person can, if he/she wishes, leave a more or less brilliant wake behind them.

There are infinite possibilities of error, and more cranks take up fashionable untruths than unfashionable truths.

Reason is a harmonising, controlling force rather than a creative one.

The infliction of cruelty with a good conscience is a delight to moralists - that is why they invented hell.

What is best in mathematics deserves not merely to be learnt as a task, but to assimilated as a part of daily thought, and brought again and again before the mind with ever-renewed encouragement.