Gravity explains the motions of the planets, but it cannot e... - Isaac Newton

"My powers are ordinary. Only my application brings me success."

"I can calculate the motion of heavenly bodies but not the madness of people."

"Tact is the art of making a point without making an enemy."

"Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion."

"I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me."