These things I have spoken to you. He again repeats how necessary those consolations are which he had addressed to them; and he proves it by this argument, that numerous distresses and tribulations await them in the world. We ought to attend, first, to this admonition, that all believers ought to be convinced that their life is exposed to many afflictions, that they may be disposed to exercise patience. Since, therefore, the world is like a troubled sea, true peace will be found nowhere but in Christ. Next, we ought to attend to the manner of enjoying that peace, which he describes in this passage. He says that they will have peace, if they make progress in this doctrine. Do we wish then to have our minds calm and easy in the midst of afflictions? Let us be attentive to this discourse of Christ, which in itself will give us peace But be of good courage. As our sluggishness must be corrected by various afflictions, and as we must be awakened to seek a remedy for our distress, so the Lord does not intend that our minds shall be cast down, but rather that we shall fight keenly, which is impossible, if we are not certain of success; for if we must fight, while we are uncertain as to the result, all our zeal will quickly vanish. When, therefore, Christ calls us to the contest, he arms us with assured confidence of victory, though still we must toil hard. I have overcome the world. As there is always in us much reason for trembling, he shows that we ought to be confident for this reason, that he has obtained a victory over the world, not for himself individually, but for our sake. Thus, though in ourselves almost overwhelmed, if we contemplate that magnificent glory to which our Head has been exalted, we may boldly despise all the evils which hang over us. If, therefore, we desire to be Christians, we must not seek exemption from the cross, but must be satisfied with this single consideration, that, fighting under the banner of Christ, we are beyond all danger, even in the midst of the combat. Under the term World, Christ here includes all that is opposed to the salvation of believers, and especially all the corruptions which Satan abuses for the purpose of laying snares for us.

In me - In my presence, and in the aid which I shall render you by the Holy Spirit.
In the world - Among the men to whom you are going. You must expect to be persecuted, afflicted, tormented.
I have overcome the world - He overcame the prince of this world by his death, John 12:31. He vanquished the great foe of man, and triumphed over all that would work our ruin. He brought down aid and strength from above by his death; and by procuring for us the friendship of God and the influence of the Spirit; by his own instructions and example; by revealing to us the glories of heaven, and opening our eyes to see the excellence of heavenly things, he has furnished us with the means of overcoming all our enemies, and of triumphing in all our temptations. See the notes at John 14:19; also Romans 8:34-37; 1-John 4:4; 1-John 5:4; Revelation 12:11. Luther said of this verse "that it was worthy to be carried from Rome to Jerusalem upon one's knees." the world is a vanquished enemy; Satan is a humbled foe; and all that believers have to do is to put their trust in the Captain of their salvation, putting on the whole armor of God, assured that the victory is theirs, and that the church shall yet shine forth fair as the moon, clear as the sun, and terrible as an army with banners, Song 6:10.

That in me ye might have peace - I give you this warning as another proof that I know all things, and to the end that ye may look to me alone for peace and happiness. The peace of God is ever to be understood as including all possible blessedness - light, strength, comfort, support, a sense of the Divine favor, unction of the Holy Spirit, purification of heart, etc., etc., and all these to be enjoyed in Christ.
In the world ye shall have tribulation - Or, as most of the very best MSS. read, εχετε, ye have - the tribulation is at hand; ye are just about to be plunged into it.
But be of good cheer - Do not despond on account of what I have said: the world shall not be able to overcome you, how severely soever it may try you.
I have overcome the world - I am just now going by my death to put it and its god to the rout.
My apparent weakness shall be my victory; my ignominy shall be my glory; and the victory which the world, the devil, and my adversaries in general, shall appear to gain over me, shall be their own lasting defeat, and my eternal triumph. - Fear not!
Luther writing to Philip Melancthon, quotes this verse, and adds these remarkable words: "Such a saying as this is worthy to be carried from Rome to Jerusalem upon one's knees."
One of the grand subjects in this chapter, the mediation of Christ, is but little understood by most Christians. Christ having made an atonement for the sin of the world, has ascended to the right hand of the Father, and there he appears in the presence of God for us. In approaching the throne of grace, we keep Jesus as our sacrificial victim, continually in view: our prayers should be directed through him to the Father; and, under the conviction that his passion and death have purchased every possible blessing for us, we should, with humble confidence, ask the blessings we need; and, as in him the Father is ever well pleased, we should most confidently expect the blessings he has purchased. We may consider, also, that his appearance before the throne, in his sacrificial character, constitutes the great principle of mediation or intercession. He has taken our nature into heaven; in that he appears before the throne: this, without a voice, speaks loudly for the sinful race of Adam, for whom it was assumed, and on whose account it was sacrificed. On these grounds every penitent and every believing soul may ask and receive, and their joy be complete. By the sacrifice of Christ we approach God; through the mediation of Christ God comes down to man.

(11) These things I have spoken unto you, that (h) in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.
(11) The surety and foundation of the Church depends only upon the victory of Christ.
(h) That in me you might be thoroughly quieted. For by "peace" is meant here that quiet state of mind which is completely contrary to disquietness and great sadness.

These things I have spoken unto you,.... As this is the conclusion of our Lord's sermons to his disciples, these words may well enough be thought to have regard to all that he had said in general; as concerning his departure from them; his going to prepare a place for them; his union to them, and their communion with him; and the various persecutions and afflictions they should endure for his sake; and the many blessings both of grace and glory they should enjoy; and particularly what he had said in the context, concerning their forsaking him, which supposed tribulation, and would be a prelude of what they were afterwards to have in the world; and concerning the presence of his Father with him, and which they might also expect to have:
that in me ye might have peace; not in the world, in which they were to have tribulation: there is no true, solid peace, to be enjoyed in the world, and the things of it; the world can neither give it, nor take it away; nor have the men of it any knowledge and understanding of it; and much less enjoy it: nor in themselves; spiritual peace does not arise from any duties, services, and performances of men; no, not from an attendance on the Gospel, and the ordinances of it; nor even from the graces of the Spirit; for though peace may be enjoyed herein, and hereby, and through these, as means; yet does not come from them, but from Christ, in whose strength alone all duties are performed aright; who is the sum and substance of the Gospel, and the ordinances of it, and the object of all grace: it is in him, and in him only, in his person, blood, righteousness, and sacrifice, which speak peace, pardon, and atonement, that a soul finds any true, solid peace, rest, comfort, and joy; and here he may, and does find it, in opposition to the cry of sin, law, and justice, for wrath, ruin, hell, and damnation. There is a peace by Christ, which he has made for his people by the blood of his cross; and there is a peace in him, which is enjoyed through faith's looking to his blood for pardon, to his righteousness for justification, to his sacrifice for atonement and satisfaction; and by having communion with him, and discoveries of his love, and by seeing safety and security in him.
In the world ye shall have tribulation; this is certain from this declaration of Christ, who is the omniscient God, and truth itself; from the instance and example of Christ, who was all his life a man of sorrows; from the conformity of the members to the head; from the divine appointment that has so determined it; from the natural enmity of the world to the saints; from the experience of the people of God in all ages; from the usefulness of tribulation to try the graces, and bring about the temporal, spiritual, and eternal good of believers: and though they have tribulation in the world, yet not by way of punishment for sin, but as fatherly corrections and chastenings for their good, that they may not be condemned with the world; and it is only in this present world they have it; as soon as they have done with the world, they will have done with tribulation:
but be of good cheer, I have overcome the world; it is very observable how the phrase, "in the world ye shall have tribulation", stands, and is encompassed, before, with these words, "that in me ye might have peace", and behind, with these, "be of good cheer", &c. Believers, of all men, notwithstanding their tribulations, have reason to be of good cheer, since their sins are forgiven, the love of God is shed abroad in their hearts, their redemption draws nigh, and they have hopes of glory; and particularly, because as Christ here says, for their encouragement under all their tribulations in the world, "I have overcome the world": Satan, the god and prince of the world, with all his principalities and powers, which Christ has led captive, ransomed his people from, and delivers them from the power of; and all that is in the world, the lusts and sins of it, their damning power by the sacrifice of himself, and their governing power by his Spirit and grace; and the men of the world with all their rage and fury, whom he has trodden down in his anger, restrains by his power, and causes the remainder of their wrath to praise him; in all which conquests he makes his people share, and even makes them more than conquerors, through himself: so that they have nothing to fear from the world; nor any reason to be cast down by the tribulation they meet with in it.

These things I have spoken unto you--not the immediately preceding words, but this whole discourse, of which these were the very last words, and which He thus winds up.
that in me ye might have peace--in the sublime sense before explained. (See on John 14:27).
In the world ye shall have tribulation--specially arising from its deadly opposition to those who "are not of the world, but chosen out of the world." So that the "peace" promised was far from an unruffled one.
I have overcome the world--not only before you, but for you, that ye may be able to do the same (1-John 5:4-5).

I have overcome the world. In this world his disciples would be persecuted and have sorrow, but he bids them Be of good cheer. The world can only afflict for a season; it is a conquered world; Christ has overcome it.