Jealousy lives upon doubts. It becomes madness or ceases entirely as soon as we pass from doubt to certainty. – Francois de La Rochefoucauld

Jealousy – that jumble of secret worship and ostensible aversion. – Emile M. Cioran

There is something mean in human nature that prefers to think evil, that gives a willing ear and a ready welcome to calumny, a sort of jealousy of goodness and greatness and things of good report. – Richard Le Gallienne