A bad man can do a million times more harm than a beast.
Neither old people nor sour people seem to make friends easily; for there is little that is pleasant in them.
Where the laws are not supreme, there demagogues spring up.
The excellence of a thing is related to its proper function.
Let us be well persuaded that everyone of us possesses happiness in proportion to his virtue and wisdom, and according as he acts in obedience to their suggestion.
We should venture on the study of every kind of animal without distaste; for each and all will reveal to us something natural and something beautiful.