“It is the mark of an educated man to look for precision in each class of things just so far as the nature of the subject admits; it is evidently equally foolish to accept probable reasoning from a mathematician and to demand from a rhetorician scientific proofs.”
More from Aristotle
“Character is determined by choice, not opinion.”
“We cannot learn without pain.”
“What prompts us to action is desire; and desire has three forms—appetite, passion, wish.”
“To avoid criticism say nothing, do nothing, be nothing.”