I can calculate the motion of heavenly, bodies but not the madness of people.
We build too many walls and not enough bridges.
I was like a boy playing on the sea-shore and diverting myself now and then finding a smoother pebble or a prettier shell than ordinary whilst the great ocean of truth lay all undiscovered before me.
We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.