Isaac Newton

I shall not mingle conjectures with certainties.

The whole of nature is nothing but a mathematical poem.

I have been a long time in the study of the Scriptures, and I am persuaded that they are the word of God.

Truth is the offspring of silence and meditation.

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

I have studied these things. I am convinced of them.

The proper method for inquiring into the properties of things is to deduce them from experiments.

The change of motion is proportional to the motive force impressed and takes place in the direction of the straight line in which that force is impressed.

For in the beginning of time, the Creator, by his infinite wisdom and power, formed the world out of nothing.

He that in the study of philosophy looks for causes, must come to the first cause, which is not mechanical.

For it is the business of experimental philosophy to find out the laws of nature, and to apply them to the solution of phenomena.

The variety of motion which we find in the world is not to be accounted for by mechanical principles alone.

I consider the heavens as a book, which God has opened to us, to teach us his perfections.

The true way of philosophizing is to deduce the properties of things from phenomena, and to infer the causes from the effects, till we come to the very first cause, which is certainly not mechanical.

The whole of nature is a book written in the language of mathematics.

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.

He that hath an ear, let him hear what the Spirit saith unto the churches.

The power of gravity is not to be accounted for by any material cause, but must be the effect of some agent, acting constantly according to certain laws.

I can calculate the motion of heavenly bodies, but not the madness of people.

Plato is my friend, Aristotle is my friend, but truth is more my friend.