“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.”

“What man dare, I dare.Approach thou like the rugged Russian bear,The armed rhinoceros, or th' Hyrcan tiger;Take any shape but that, and my firm nervesShall never tremble.”

“Men are so charmed with valor that they have pleased themselves with being called lions, leopards, eagles and dragons, from the animals contemporary with us in the geologic formations.”

“There's no better sign of a brave mind than a hard hand.”