Sadness diminishes a man's powers

I do not presume that I have found the best philosophy, I know that I understand the true philosophy.

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

One and the same thing can at the same time be good, bad, and indifferent, e.g., music is good to the melancholy, bad to those who mourn, and neither good nor bad to the deaf.

The idea, which constitutes the actual being of the human mind, is not simple, but compounded of a great number of ideas.

Nature is satisfied with little; and if she is, I am also.

Everything excellent is as difficult as it is rare.