You risk just as much in being credulous as in being suspicious.

Do you see this egg? With this you can topple every theological theory, every church or temple in the world.

Which is the greater merit, to enlighten the human race, which remains forever, or to save one's fatherland, which is perishable?

You live as if you were destined to live forever, no thought of your frailty ever enters your head, of how much time has already gone by you take no heed. You squander time as if you drew from a full and abundant supply, so all the while that day which you bestow on some person or thing is perhaps your last. You have all the fears of mortals and all the desires of immortals… What foolish forgetfulness of mortality to defer wise resolutions to the fiftieth or sixtieth year, and to intend to begin life at a point to which few have attained.

When we know to read our own hearts, we acquire wisdom of the heartsof others.

If you want me to believe in God, you must make me touch him.

There is less harm to be suffered in being mad among madmen than in being sane all by oneself.