Unthinking respect for authority is the greatest enemy of truth.

Try not to become a man of success, but rather try to become a man of value.

We owe a lot to the Indians, who taught us how to count, without which no worthwhile scientific discovery could have been made.

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

Throughout human history, as our species has faced the frightening, terrorizing fact that we do not know who we are, or where we are going in this ocean of cha…

To think for oneself is not only, as Gide said, counterrevolutionary but also apostasy and, at certain times, treason.

'No man -prince, peasant, pope, -has all the light, who says else is a mountebank. I claim no private lien on truth, only a liberty to seek it, prove it in deb…