Metaphysics is universal and is exclusively concerned with primary substance. ... And here we will have the science to study that which is, both in its essence and in the properties which it has.

The greatest injustices proceed from those who pursue excess, not by those who are driven by necessity.

Metaphysics is universal and is exclusively concerned with primary substance. ... And here we will have the science to study that which is, both in its essence and in the properties which it has.

A body in motion can maintain this motion only if it remains in contact with a mover.

Of the irrational part of the soul again one division appears to be common to all living things, and of a vegetative nature.

Through discipline comes freedom.

For imagining lies within our power whenever we wish . . . but in forming opinons we are not free . . .