“When a man is prey to his emotions, he is not his own master.”

Sadness diminishes a man’s powers.

Freedom is self-determination.

The most tyrannical of governments are those which make crimes of opinions, for everyone has an inalienable right to his thoughts.

In so far as the mind sees things in their eternal aspect, it participates in eternity.

A free man thinks of nothing less than of death, and his wisdom is a meditation, not on death, but on life.

Minds, however, are conquered not by arms, but by love and nobility.

Desire nothing for yourself, which you do not desire for others.

Nothing in Nature is random. A thing appears random only through the incompleteness of our knowledge.

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

The mind of God is all the mentality that is scattered over space and time, the diffused consciousness that animates the world.

I call him free who is led solely by reason.

No matter how thin you slice it, there will always be two sides.

He alone is free who lives with free consent under the entire guidance of reason.

Reason is no match for passion.

Philosophy has no end in view save truth; faith looks for nothing but obedience and piety.

We feel and experience ourselves to be eternal.