If I have been able to see farther, it was only because I stood on the shoulders of giants.
- Sir Isaac Newton

Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
- Sir Isaac Newton Principia Mathematica (1687) Laws of Motion I

The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
- Sir Isaac Newton Principia Mathematica (1687) Laws of Motion II

To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
- Sir Isaac Newton Principia Mathematica (1687) Laws of Motion III

Plato is my friend — Aristotle is my friend — but my greatest friend is truth.
- Sir Isaac Newton

In the absence of any other proof, the thumb alone would convince me of God’s existence.
- Sir Isaac Newton

Truth is ever to be found in the simplicity, and not in the multiplicity and confusion of things.
- Sir Isaac Newton

I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
- Sir Isaac Newton