Except our own thoughts, there is nothing absolutely in our power.

The good of the intellect is the acquisition of knowledge, and the good of the will is the achievement of moral perfection.

The mind can be rightly controlled only by controlling the body.

It is necessary to rouse oneself from sleep and to apply oneself to study with a fresh mind.

The senses are of two kinds; one is natural, namely, the five; the other is spiritual.

The power of judging aright and of distinguishing the true from the false, which is properly what is called good sense or reason, is by nature equal in all men.

We must make haste then, not only because we are daily nearer to death, but also because the conception of things and the understanding of them cease first.

To be wrong is nothing unless you continue remembering it.

The greatest wisdom consists in knowing one's own follies.

In order to improve the mind, we ought less to learn than to contemplate.

The first precept was never to accept a thing as true until I knew it as such without a single doubt.

I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.

We do not describe the world we see, we see the world we can describe.

To know what people really think, pay regard to what they do, rather than what they say.

Travelling is almost like talking with men of other centuries.

Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.

It is not enough to understand, you must also act.