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

The motions which the planets now have could not spring from any natural cause alone, but were impressed by an intelligent Agent.

God is a challenge because there is no proof of his existence and therefore the search must continue.

The same thing is to be understood of all bodies, revolved in any orbits. They all endeavour to recede from the centres of their orbits, and were it not for the opposition of a contrary force which restrains them to and detains them in their orbits, which I therefore call Centripetal, would fly off in right lines with a uniform motion.

Up to this day, there has been no proof of the existence of any intelligence other than the human.

God in the beginning formed matter in solid, massy, hard, impenetrable, movable particles, of such sizes and figures, and with such other properties, and in such proportion to space, as most conduced to the end for which he formed them.