John 16:33

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" 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.