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.

Nature does nothing in vain when less will serve; for Nature is pleased with simplicity and affects not the pomp of superfluous causes.

I shall not mingle conjectures with certainties.

Blind metaphysical necessity, which is certainly the same always and every where, could produce no variety of things. All that diversity of natural things which we find suited to different times and places could arise from nothing but the ideas and will of a Being, necessarily existing.

You have to make the rules, not follow them

In the absence of any other proof, the thumb alone would convince me of God's existence.