Again, Practical Wisdom and Excellence of the Moral character are very closely united; since the Principles of Practical Wisdom are in accordance with the Moral Virtues and these are right when they accord with Practical Wisdom.

Human beings are by nature political animals.

There is a foolish corner in the brain of the wisest man.

Happiness, therefore, being found to be something final; and self-sufficient, is the end at which all actions aim.

We acquire a particular quality by acting in a particular way.

Happiness also requires external goods in addition.

Our first presupposition must be that in nature nothing acts on, or is acted on by, any other thing at random, nor may anything come from anything else, unless we mean that it does so in virtue of a concomitant attribute.

The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.

If you would understand anyting, observe its beginning and its development.

For what is the best choice, for each individual is the highest it is possible for him to achieve.

The void is 'not-being,' and no part of 'what is' is a 'not-being,'; for what 'is' in the strict sense of the term is an absolute plenum. This plenum, however, is not 'one': on the contrary, it is a 'many' infinite in number and invisible owing to the minuteness of their bulk.

A sense is what has the power of receiving into itself the sensible forms of things without the matter, in the way in which a piece of wax takes on the impress of a signet-ring without the iron or gold.

He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.

The high-minded man must care more for the truth than for what people think.

It is the characteristic of the magnanimous man to ask no favor but to be ready to do kindness to others.

The quality of life is determined by its activities.

A man without regrets cannot be cured.

Now if you have proofs to bring forward, bring them forward, and your moral discourse as well; if you have no enthymemes, then fall back upon moral discourse: after all, it is more fitting for a good man to display himself as an honest fellow than as a subtle reasoner.

When people are friends, they have no need of justice, but when they are just, they need friendship in addition.

Through discipline comes freedom.

Quality is not an act, it is a habit.

Pleasure in the job puts perfection in the work.

Philosophy can make people sick.

Nothing moves without having been moved.

Law is mind without reason.

Hope is the dream of a waking man.

Happiness depends upon ourselves.

Education is the best provision for old age.

Change in all things is sweet.

Between friends there is no need of justice.

All men by nature desire knowledge.

A true friend is one soul in two bodies.

A friend is a second self.