The fundamental cause of trouble in the world is that the stupid are cocksure while the intelligent are full of doubt. (Bertrand Russell)

It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. (Carl Sagan)

I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. (Umberto Eco)

The true measure of a man is how he treats someone who can do him absolutely no good. (Samuel Johnson)

You can only find truth with logic if you have already found truth without it. (Gilbert Keith Chesterton)