Tact is the art of making a point without making an enemy. - Isaac Newton

"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."

"Lo que sabemos es una gota de agua; lo que ignoramos es un océano."

"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."

"Nature is pleased with simplicity. And nature is no dummy"