If you were of the world, the world would love its own: but because you are not of the world, but I have chosen you out of the world, therefore the world hates you.
All Commentaries on John 15:19 Go To John 15
Cyril of Alexandria
AD 444
He lightens by His art even that which was most grievous, and gives them unexpected pleasure at that which it was reasonable to suppose would greatly trouble them. For to be hated by any is truly burdensome, because sly injuries and unexpected devices are the result; yet this too is sweet when it happens for the sake of God and righteousness, and it supplies a convincing proof that the man against whom some thus act is not of the world. For as we find physical so also shall we find moral affinities, and a sameness and complete likeness of disposition is sufficient to undermine mere blood-relationship.
For every creature loveth its like, according to the Scripture, and a man will be attached to his like. Now whereas similarity of character renews the law of love towards one another, the holy will live with the holy and very readily conform to him, and be joined to him in friendly union. And so also will be the attitude of one of like disposition towards a blasphemer. For this reason the Mosaic Law made a complete distinction between what was holy and profane, keeping such things apart and separate from one another according to the law of love.
Evil company doth corrupt good manners, and differences of disposition are at war with one another, and wills that are divided look in opposite directions and almost accuse one another: each being enamoured of its own pursuit. The lover of virtue then must incur hatred for the very things which excite our admiration----his rebuking vice and unveiling the vileness of the wicked by the contrast that his own manner of life presents. For when goodness is seen by its side, what is evil must appear unseemly. For this cause then I think those who are not enamoured of the same manner of life rage against the virtuous.
He bids then His disciples not be pained, even though they see themselves hateful to the world on account of their love of virtue and righteousness towards Him, but explains that they ought on the contrary to rejoice, receiving the hatred of the world as a proof of their dignity and praise with God. For see how dangerous He has shown their not enduring to suffer (which it was likely they would prefer) to be. For to be hated by any was not absolutely without loss. But it has not the free pardon from God, and the great gain which results from preferring to suffer it. For if the man who is hated by those who mind worldly things is considered as outside the world, it is necessary then to suppose that the man who is not hated is united to the vices of the world.
What then has Christ established by these words? That they should preach His word with boldness, and should not permit their hearers to be unprofited, from their regard towards sinners or those who prefer to disobey the Divine command; but that, leaving unnoticed the affronts that will often result from being hated, they should give bold and fearless counsel, passing by nothing whatsoever or esteeming anything of more consequence than the necessity of serving God. This object St. Paul well accomplishes when he writes thus: For am I now persuading mien, or God? or am I seeking to please men? If I were still pleasing men, I should not be a servant of Christ. For it is not possible to please evil men and God. For how could the two coincide, the will of each presenting the widest divergence? For one looks towards virtue, and the other looks towards vice. The man therefore who wishes only to be the servant of God, and who regards nothing as superior to piety towards Him, must necessarily be in conflict with those who love the world, whenever he persuades them to a state of mind out of harmony with the vain folly of the world. For advice which calls to something else is most intolerable to lovers of pleasure, as assuredly are profitable and severe remedies to those whose bodies are diseased by these passions.