Those who act receive the prizes.

Pleasure in the job puts perfection in the work.

For both excessive and insufficient exercise destroy one's strength, and both eating and drinking too much or too little destroy health, whereas the right quantity produces, increases and preserves it. So it is the same with temperance, courage and the other virtues. This much then, is clear: in all our conduct it is the mean that is to be commended.

All virtue is summed up in dealing justly.

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.

He who cannot be a good follower cannot be a good leader.

The shape of the heaven is of necessity spherical; for that is the shape most appropriate to its substance and also by nature primary.