There is no great genius without a mixture of madness – Aristotle

All human actions have one or more of these seven causes: chance, nature, compulsions, habit, reason, passion, desire – Aristotle

Friendship is a single soul dwelling in two bodies – Aristotle

Jealousy is both reasonable and belongs to reasonable men, while envy is base and belongs to the base, for the one makes himself get good things by jealousy, while the other does not allow his neighbour to have them through envy – Aristotle

It is just that we should be grateful, not only to those with whose views we may agree, but also to those who have expressed more superficial views; for these also contributed something, by developing before us the powers of thought – Aristotle

All men by nature desire knowledge – Aristotle