Marvel not, my brethren, if the world hall you. This is an inference from the previous antithesis of the children of God, and the children of the devil. Our Lord alludes to the hatred of wicked men against Christ in S. John xv18. Everything is opposed to and hates its contrary, as black is opposed to white, cold to heat, sweetness to bitterness, &c. The world hates the faithful—1st Because their ways of going on are so different. See Wisdom of Solomon 2:15. And S. Leo (Serm. ix. de Quadrig.), "Wickedness never is at peace with righteousness. Drunkenness ever hates temperance, &c.; and so obstinate is this opposition, that when there is peace without there is war within, so that it never ceases to disquiet the hearts of the righteous; and it is true that they who wish to live godly in Christ Jesus will suffer persecution, and that our whole life is a temptation." And he gives as another reason the craft and malice of the devil, who when he cannot overpower our virtue would undermine our faith.
2d. There is further the envy which worldlings feel when they see that the righteous are not ensnared by their evil desires, but are stedfastly going on towards heaven, while they themselves are sinking down and down to hell.
3d. They hate the righteous, because they withdraw themselves from their company. See Matthew 15:18; Wisdom of Solomon 2:16.
4th. Because their conduct is a tacit reproof to the worldly. See Wisdom of Solomon 2:12; and John 15:8.
5th. Worldlings are full of self-love, but Saints are full of the love of God, for which reason they hate them.
S. James ( James 4:4) agrees with S. John , and so does S. Paul, Galatians 1:10. Tertullian and others read here, "Be not afraid," for some not only marvelled, but were afraid of the hatred they would incur in becoming Christians. S. John therefore exhorts them not to be surprised or afraid, for those whom the world hates God loves. "It would be a greater wonder," says Didymus, "if wicked men did love those who were godly." We must not therefore in the least regard the hatred of such persons, but rather persevere in holiness and love of God, and make it our endeavour to make them our friends when they hear that we surpass them in charity.
As S. Peter says, 1 Peter 4:12. And Sencea (de Prov. cap. i.) says, "God brings not up a good man in delicate ways; He makes trial of him, He hardens him, and thus prepares him for Himself, while the man himself considers all misfortunes as means of training, and as teaching him how much his patience can bear." And S. Basil (adm. ad filii spirit) says that "Patience is the highest virtue of the mind, enabling us most speedily to attain the height of perfection." S. Augustine gives the reason, that God, through the hatred of the world, may draw us on to love Himself. "Oh the unhappiness of mankind! The world is bitter, and yet is loved. But how much more would it be loved, if it were sweet! How gladly wouldest thou gather its flowers, since thou withdrawest not this hand even from its thorns."