Envy Nature
A man that hath no virtue in himself, ever envieth virtue in others. For men's minds, will either feed upon their own good, or upon others' evil; and who wanteth the one, will prey upon the other; and whoso is out of hope, to attain to another's virtue, will seek to come at even hand, by depressing another's fortune.
A man that is busy, and inquisitive, is commonly envious. For to know much of other men's matters, cannot be because all that ado may concern his own estate; therefore it must needs be, that he taketh a kind of play-pleasure, in looking upon the fortunes of others. Neither can he, that mindeth but his own business, find much matter for envy. For envy is a gadding passion, and walketh the streets, and doth not keep home.
Francis Bacon, in "Essays"