By doubting we come to questioning, and by questioning we perceive the truth.

The key to wisdom is this - constant and frequent questioning, for by doubting we are led to question and by questioning we arrive at the truth.

Under the pretext of study we spent our hours in the happiness of love, and learning held out to us the secret opportunities that our passion craved. Our speech was more of love than of the books which lay open before us; our kisses far outnumbered our reasoned words.

It is by doubting that we come to investigate, and by investigating that we recognize the truth.

The men who abandon themselves to the passions of this miserable life, are compared in Scripture to beasts.

I preferred the weapons of dialectic to all the other teachings of philosophy, and armed with these, I chose the conflicts of disputation rather than the trophies of war.

Nothing can be believed unless it is first understood; and that for any one to preach to others that which either he has not understood nor they have understood is absurd.