John 15:18-21

Verse 18

If the world hate you - As the followers of Christ were to be exposed to the hatred of the world, it was no small consolation to them to know that that hatred would be only in proportion to their faith and holiness; and that, consequently, instead of being troubled at the prospect of persecution, they should rejoice, because that should always be a proof to them that they were in the very path in which Jesus himself had trod. Dr. Lardner thinks that πρωτον is a substantive, or at least an adjective used substantively, and this clause of the text should be translated thus: If the world hate you, know that it hated me, your Chief. It is no wonder that the world should hate you, when it hated me, your Lord and Master, whose lips were without guile, and whose conduct was irreproachable. See the doctor's vindication of this translation, Works, vol. i. p. 306.
Verse 19

Ye are not of the world - therefore, etc. - On this very account, because ye do not join in fellowship with those who know not God, therefore they hate you. How true is that saying: - "The laws of Christ condemn a vicious world,

And goad it to revenge!"

Gambold.
Verse 20

If they have kept my saying - Or, doctrine. Whosoever acknowledges me for the Christ will acknowledge you for my ministers.

Some translate the passage thus: If they have Watched my sayings, i.e. with an intent to accuse me for something which I have said, they will Watch yours also: therefore be on your guard. Παρατηρειν has this sense, as we have had occasion to observe before; and perhaps τηρειν has the same sense here, as it is much more agreeable to the context.
Verse 21

Because they know not him that sent me - This is the foundation of all religious persecution: those who are guilty of it, whether in Church or state, know nothing about God. If God tolerates a worship which professes to have him for its object, and which does not disturb the quiet or peace of society, no man has the smallest right to meddle with it; and he that does fights against God. His letting it pass is at least a tacit command that all should treat it as he has done.
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