Now it seems that everything in the world stems from sources other than God, since the products of nature have their source in nature; deliberate effects can be traced back to human reason or will as their source. There is no need then to assume that God exists.

There can be no joy in living without joy in work.

Far graver is it to corrupt the faith that is the life of the soul than to counterfeit the money that sustains temporal life.

Perfection of moral virtue does not wholly take away the passions, but regulates them.

Practical sciences proceed by building up; theoretical science by resolving into components.

One cannot use an evil action with reference to a good intention.

Reasoning is compared to understanding as movement is to rest, or acquisition to possession.... Since movement always proceeds from something immovable, and ends in something at rest, hence it is that human reasoning, in the order of inquiry and discovery, proceeds from certain things absolutely understood--namely, the first principles; and, again, in the order of judgment, returns by analysis to first principles, in the light of which it examines what it has found. Now it is clear that rest and movement are not to be referred to different powers, but to one and the same.