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.

By doubting we are led to question, by questioning we arrive at the truth.

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

Question everything. It is the key to true happiness.

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.

The purpose and cause of the incarnation was that He might illuminate the world by His wisdom and excite it to the love of Himself.