However vast a man's spiritual resources, he is capable of but one great passion.

Not to be mad is another form of madness

If it is an extraordinary blindness to live without investigating what we are, it is a terrible one to live an evil life, while believing in God

Man's greatness lies in his power of thought.

Our senses perceive no extreme. Too much sound deafens us; too much light dazzles us; too great distance or proximity hinders ourview. Too great length and too great brevity of discourse tends to obscurity; too much truth is paralyzing.... In short, extremes are for us as though they were not, and we are not within their notice. They escape us, or we them.

He who does not know his way to the sea should take a river for his guide.

No one is offended at not seeing everything; but one does not like to be mistaken, and that perhaps arises from the fact that man naturally cannot see everything, and that naturally he cannot err in the side he looks at, since the perceptions of our senses are always true.