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.
Sir Isaac Newton PRS (25 December 1642 – 20 March 1726/27) was an English mathematician, astronomer, and physicist (described in his own day as a "natural philosopher") who is widely recognised as one of the most influential scientists of all time and a key figure in the scientific revolution. His book Philosophiæ Naturalis Principia Mathematica (1687), laid the foundations of classical mechanics.
Enjoy the best Isaac Newton picture quotes.
Read more about Isaac Newton on Wikipedia.