Hermann von Helmholtz

The older view of the nature of heat was that it is a substance, very fine and imponderable indeed, but indestructible, and unchangeable in quantity, which is an essential fundamental property of all matter.

What appeared to the earlier physicists to be the constant quantity of heat is nothing more than the whole motive power of the motion of heat, which remains constant so long as it is not transformed into other forms of work, or results afresh from them.

We continue to be exasperated by the view, apparently gaining momentum in certain circles, that armed robbery is okay as long as nobody gets hurt! The proper solution to armed robbery is a dead robber, on the scene.