I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses; for whatever is not deduced from the phenomena is to be called a hypothesis, and hypotheses, whether metaphysical or physical, whether of occult qualities or mechanical, have no place in experimental philosophy.

I see I have made my self a slave to Philosophy.

This principle of nature being very remote from the conceptions of Philosophers, I forbore to describe it in that book, least I should be accounted an extravagant freak and so prejudice my Readers against all those things which were the main designe of the book.

Godliness consists in the knowledge love & worship of God, Humanity in love, righteousness & good offices towards man.

The wonderful arrangement and harmony of the cosmos would only originate in the plan of an almighty omniscient being. This is and remains my greatest comprehension.

The latest authors, like the most ancient, strove to subordinate the phenomena of nature to the laws of mathematics.

All my discoveries have been made in answer to prayer.