True virtue is life under the direction of reason.

Everything great is just as difficult to realize as it is rare to find.

In the mind there is no absolute or free will; but the mind is determined to wish this or that by a cause, which has also been determined by another cause, and this last by another cause, and so on to infinity.

The world would be happier if men had the same capacity to be silent that they have to speak.

In proportion as we endeavor to live according to the guidance of reason, shall we strive as much as possible to depend less on hope, to liberate ourselves from fear, to rule fortune, and to direct our actions by the sure counsels of reason.

Ceremonies are no aid to blessedness.

Measure, time and number are nothing but modes of thought or rather of imagination.