His writings include books of rhetoric, orations, philosophical and political treatises, and letters. He is remembered in modern times as the greatest Roman orator and the innovator of what became known as Ciceronian rhetoric.

Times are bad. Children no longer obey their parents, and everyone is writing a book.

A room without books is like a body without a soul.

Hatreds not vowed and concealed are to be feared more than those openly declared.

The study and knowledge of the universe would somehow be lame and defective were no practical results to follow.

In a disordered mind, as in a disordered body, soundness of health is impossible.

Nature has planted in our minds an insatiable longing to see the truth.

Even if you have nothing to write, write and say so.

A tear dries quickly when it is shed for troubles of others.

We must conceive of this whole universe as one commonwealth of which both gods and men are members.

In doubtful cases the more liberal interpretation must always be preferred.

The precepts of the law are these: to live honestly, to injure no one, and to give everyone else his due.

People do not understand what a great revenue economy is.

A man's own manner and character is what most becomes him.

When you are aspiring to the highest place, it is honorable to reach the second or even the third rank.

The false is nothing but an imitation of the true.

I never admire another's fortune so much that I became dissatisfied with my own.

Great is the power of habit. It teaches us to bear fatigue and to despise wounds and pain.

The greatest pleasures are only narrowly separated from disgust.

The good of the people is the greatest law.

Glory follows virtue as if it were its shadow.

Time destroys the speculation of men, but it confirms nature.

Old age: the crown of life, our play's last act.