To every action there is always opposed an equal reaction.
If I have seen further than others, it is by standing upon the shoulders of giants.
I can calculate the motion of heavenly bodies, but not the madness of people.
To myself I am only a child playing on the beach, while vast oceans of truth lie undiscovered before me.
I was like a boy playing on the sea-shore, and diverting myself now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
Tact is the art of making a point without making an enemy.
A man may imagine things that are false, but he can only understand things that are true, for if the things be false, the apprehension of them is not understanding.
Errors are not in the art but in the artificers.
To me there has never been a higher source of earthly honor or distinction than that connected with advances in science.
It is the weight, not numbers of experiments that is to be regarded.
About Isaac Newton:
was an English physicist and mathematician (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and as a key figure in the scientific revolution. His book Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy"), first published in 1687, laid the foundations for classical mechanics. Newton made seminal contributions to optics, and he shares credit with Gottfried Leibniz for the development of calculus.