If I am anything, which I highly doubt, I have made myself so by hard work.

I shall not mingle conjectures with certainties.

I do not know what I may appear to the world, but to myself I seem to have been only a boy playing on the seashore.

He who thinks half-heartedly will not believe in God; but he who really thinks has to believe in God.

All knowledge and understanding of the Universe was no more than playing with stones and shells on the seashore of the vast imponderable ocean of truth.

Are not gross bodies and light convertible into one another; and may not bodies receive much of their activity from the particles of light which enter into their composition? The changing of bodies into light, and light into bodies, is very conformable to the course of Nature, which seems delighted with transmutations.

Oh Diamond! Diamond! thou little knowest the mischief done! [Apocryphal]