The best things are placed between extremes.

To Thales the primary question was not what do we know, but how do we know it.

Therefore, the good of man must be the end of the science of politics.

The virtue of the good man is necessarily the same as the virtue of the citizen of the perfect state.

These two rational faculties may be designated the Scientific Faculty and the Calculative Faculty respectively; since calculation is the same as deliberation, and deliberation is never exercised about things that are invariable, so that the Calculative Faculty is a separate part of the rational half of the soul.

I have gained this from philosophy: that I do without being commanded what others do only from fear of the law.

It is possible to fail in many ways . . . while to succeed is possible only in one way (for which reason also one is easy and the other difficult - to miss the mark easy, to hit it difficult).