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

There are more sure marks of authenticity in the Bible than in any profane history.

The description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn.

If I had stayed for other people to make my tools and things for me, I had never made anything.

The seed of a tree has the nature of a branch or twig or bud. It is a part of the tree, but if separated and set in the earth to be better nourished, the embryo or young tree contained in it takes root and grows into a new tree.

Sir Isaac Newton was asked how he discovered the law of gravity. He replied, "By thinking about it all the time.

The changing of Bodies into Light, and Light into Bodies, is very conformable to the Course of Nature, which seems delighted with Transmutations.