The authority of reason is far more imperious than that of a master; for he who disobeys the one is unhappy, but he who disobeys the other is a fool.

There are two equally dangerous extremes-to shut reason out, and to let nothing else in.

Eloquence is the painting of thought.

Let each of us examine his thoughts

The immortality of the soul is a matter which is of so great consequence to us and which touches us so profoundly that we must have lost all feeling to be indifferent about it.

Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.

Things are always at their best in their beginning.