Every body continues in its state of rest, or of uniform motion in a right [straight] line, unless it is compelled to change that state by forces impressed upon it.
Source: the first law of motion, 'Principia mathematica', A. Motte, transl.
-- Isaac Newton, (Dec 25 1642-1727), English mathematician, philosopher; He was first to describe the laws of motion and universal gravitation; also invented the reflecting telescope, 1668.