“We, on the other hand, must take for granted that the things that exist by nature are, either all or some of them, in motion.”

“Definition of tragedy: A hero destroyed by the excess of his virtues”

“A body in motion can maintain this motion only if it remains in contact with a mover.”

“For any two portions of fire, small or great, will exhibit the same ratio of solid to void; but the upward movement of the greater is quicker than that of the less, just as the downward movement of a mass of gold or lead, or of any other body endowed with weight, is quicker in proportion to its size.”

“Something is infinite if, taking it quantity by quantity, we can always take something outside.”

“The way to learn German, is, to read the same dozen pages over and over a hundred times, till you know every word and particle in them, and can pronounce and repeat them by heart.”

“That which we persist in doing becomes easier to do, not that the nature of the thing has changed but that our power to do has increased.”

“Use makes a better soldier than the most urgent considerations of duty,--familiarity with danger enabling him to estimate the danger. He sees how much is the risk, and is not afflicted with imagination; knows practically Marshal Saxe's rule, that every soldier killed costs the enemy his weight in lead.”