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 seashore, 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.

An object in motion tends to remain in motion along a straight line unless acted upon by an outside force.

We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.

Isaac Newton Quotes