The search for truth is more precious than its possession.

Let the devil catch you but by a single hair, and you are his forever.

As the stag which the huntsman has hit flies through bush and brake, over stock and stone, thereby exhausting his strength but not expelling the deadly bullet from his body; so does experience show that they who have troubled consciences run from place to place, but carry with them wherever they go their dangerous wounds.

He who doesn't lose his wits over certain things has no wits to lose.

Why should not every individual man have existed more than once upon this world? Why should I not come back as often as I am capable of acquiring fresh knowledge? Is this hypothesis so laughable merely because it is the oldest? Because the human understanding, before the sophistries of the schools had dissipated and debilitated it, lighted upon it at once?

It is not the truth that a man possesses, or believes that he possesses, but the earnest effort which he puts forward to reach the truth, which constitutes the worth of a man

With a clear sky, a bright sun, and a gentle breeze, you will have friends in plenty; but let fortune frown, and the firmament be overcast, and then your friends will prove like the strings of the lute, of which you will tighten ten before you find one that will bear the stretch and keep the pitch.