Isaac Newton

To any action there is always an opposite and equal reaction; in other words, the actions of two bodies upon each other are always equal and always opposite in direction.

Atheism is so senseless. When I look at the solar system, I see the earth at the right distance from the sun to receive the proper amounts of heat and light. This did not happen by chance.

I keep the subject of my inquiry constantly before me, and wait till the first dawning opens gradually, by little and little, into a full and clear light.

If others would think as hard as I did, then they would get similar results.

Live your life as an exclamation rather than an explanation.

What we know is a drop, what we don't know is an ocean.

I was like a boy playing on the seashore...

The best and safest way of philosophizing seems to be, first to inquire diligently into the properties of things, and establishing those properties by experiments, and then to proceed more slowly to hypotheses for the explanation of them.

I can't think of any. I keep no notebook. When a thought comes, I write it down on the first piece of paper at hand.

It is the weight, not numbers of experiments that is to be regarded.

The wonderful uniformity in the planetary system must be allowed the effect of choice.

I have studied these things - you have not.

O Diamond! Diamond! thou little knowest the mischief done!

I don't know what I may seem to the world. But as to myself I seem to have been only like a boy...

A body in motion tends to stay in motion unless acted upon by an external force.

For every force there is an equal and opposite force.

The force of gravity is proportional to the product of the masses and inversely proportional to the square of the distance between them.

The different refrangibility of the rays of light.

Are not the rays of light very small bodies emitted from shining substances?

Hence also it follows, that what the mathematicians call the centre of gravity is the same as the centre of mass in homogeneous bodies.