The worship of God is not a rule of safety - it is an adventure of the spirit, a flight after the unattainable.

Religion will not regain its old power until it can face change in the same spirit as does science.

Each human being is a more complex structure than any social system to which he belongs.

The point about zero is that we do not need to use it in the operations of daily life. No one goes out to buy zero fish. It is in a way the most civilised of all the cardinals, and its use is only forced on us by the needs of cultivated modes of thought.

The guiding motto in the life of every natural philosopher should be, seek simplicity and distrust it.

True courage is not the brutal force of vulgar heroes, but the firm resolve of virtue and reason.

Seek simplicity, then distrust.