Aristotle, Nicomachean Ethics
H. Rackham, Ed.

Those then who make it a term of reproach call men lovers of self when they assign to themselves the larger share of money, honors, or bodily pleasures; since these are the things which most men desire and set their hearts on as being the greatest goods, and which accordingly they compete with each other to obtain. Now those who take more than their share of these things are men who indulge their appetites, and generally their passions and the irrational part of their souls. But most men are of this kind. Accordingly the use of the term ‘lover of self’ as a reproach has arisen from the fact that self-love of the ordinary kind is bad. Hence self-love is rightly censured in those who are lovers of self in this sense.