“Wherefore, beloved brethren, against all the devil’s deceiving snares or open threatenings, the mind ought to stand arrayed and armed, ever as ready to repel as the foe is ever ready to attack. And since those darts of his which creep on us in concealment are more frequent, and his more hidden and secret hurling of them is the more severely and frequently effectual to our wounding, in proportion as it is the less perceived, let us also be watchful to understand and repel these, among which is the evil of jealousy and envy.”

(St. Cyprian of Carthage, 4th Century Church Father)