Lord, whither goest thou? This question is founded on that saying of Christ, I said to the Jews, that whither I go you cannot come, so now I say to you, (John 13:33.) From this it is evident how ignorant Peter was, who, after having been so frequently warned about Christ's departure, was as greatly perplexed as if he had heard something new. Yet in this respect we are too like him; for we hear daily from the mouth of Christ all that is fitted for usefulness in life, and all that is necessary to be known, and, when we come to practice, we are as much astonished as apprentices to whom not a word had ever been spoken. Besides, Peter shows that he is under the influence of an immoderate desire of Christ's bodily presence; for he reckons it absurd that, while he remains, Christ shall go elsewhere. Whither I go. By these words Christ restrains Peter's excessive desire. His language is concise, as becomes a Master, but immediately softens the hardness of his statement. He shows that it will only be for a time that he shall be separated from his disciples. We are taught by this passage to subject all our desires to God, that they may not go beyond their proper bounds; and if at any time they become extravagant and foolish, let us at least submit to be held in by this bridle. That we may not lose courage, let us avail ourselves of the consolation which is immediately added, when Christ promises that we shall one day be gathered to him. But thou shalt follow me afterwards. He means that Peter is not yet ripe for bearing the cross, but, like corn still in the blade, must be formed and strengthened by the progress of time, that he may follow. We ought therefore to pray to God to carry forward to a higher degree of excellence what he has begun in us. In the meantime, we must creep, till we are able to run more swiftly. Now as Christ bears with us, while we are tender and delicate, so let us learn not to reject weak brethren, who are still very far from the goal. It is desirable, indeed, that all should run with the greatest eagerness, and we ought to encourage all to quicken their pace; but if there are any who walk more slowly, we ought to hope well concerning them, provided that they keep the road.

Thou canst not follow me now - Thou hast not faith strong enough to die for me, nor is thy work yet done; but hereafter thou shalt suffer for my sake, and die in defense of my truth. See John 21:18.

(5) Simon Peter said unto him, Lord, whither goest thou? Jesus answered him, Whither I go, thou canst not follow me now; but thou shalt follow me afterwards.
(5) A weighty example of rash trust and confidence.

Simon Peter said unto him,.... One might have expected that Peter would have taken some notice of what Christ said last, about love to one another; but he passes over it, and takes no manner of notice of it; which did not arise from inattention to it, or from any dislike of it, or disaffection to it; for it appears from his whole conduct and writings, that he had the utmost regard for it; he very frequently presses it, and most fervently practised it; but having observed some words which dropped from Christ's lips, "whither I go ye cannot come", John 13:33; his mind was intent upon them, was uneasy about them, and very much wanted to know the meaning of them; and as soon as Christ had done speaking, took the opportunity to put the question:
Lord, whither goest thou? imagining he was going to some distant place in the country, and which was difficult of access; whereby he betrayed his weakness and ignorance, as the Jews did, John 6:25.
Jesus answered him, whither I go thou canst not follow me now; which words imply, that Christ was going somewhere in a little time; he was going to the garden to surrender himself up into the hands of his enemies, and hither Peter could, and did follow him, and therefore is not here meant; he was going to die for his people, in order to take away the sting of death and the curse of the law, and work out salvation for them; he was going to his Father in heaven, to receive gifts for men, and to send the Comforter; to open the way to heaven, take possession of it, and prepare it for his saints; to plead the cause, and transact the business of his dear children; and to receive a kingdom for himself, and return: now hither, as yet, Peter could not follow him; for his time of suffering death was not yet come; Christ had some other work for him to do first; he must open the door of faith to the Gentiles, and preach the Gospel to them:
but thou shall follow me afterwards; when thy time is come, and thou hast done the work allotted for thee, thou shalt follow me by dying for me; and thou shall follow me into my kingdom and glory, and be for ever with me: all the saints shall follow Christ to heaven, who is their forerunner for them entered; and as sure as he is there, so sure shall they be also; the counsels of God are unalterable, the covenant of grace is firm and sure, the blood of Christ can never be spilled in vain, his prayers and preparations cannot be fruitless, nor the work of the Spirit be ever lost; wherefore not one of those who are given to Christ, and come to him, and follow him here, but shall follow him hereafter.

What Christ had said concerning brotherly love, Peter overlooked, but spoke of that about which Christ kept them ignorant. It is common to be more eager to know about secret things, which belong to God only, than about things revealed, which belong to us and our children; to be more desirous to have our curiosity gratified, than our consciences directed; to know what is done in heaven, than what we may do to get thither. How soon discourse as to what is plain and edifying is dropped, while a doubtful dispute runs on into endless strife of words! We are apt to take it amiss to be told we cannot do this and the other, whereas, without Christ we can do nothing. Christ knows us better than we know ourselves, and has many ways of discovering those to themselves, whom he loves, and he will hide pride from them. May we endeavour to keep the unity of the Spirit in the bond of peace, to love one another with a pure heart fervently, and to walk humbly with our God.

Peter said--seeing plainly in these directions how to behave themselves, that He was indeed going from them.
Lord, whither guest thou?--having hardly a glimmer of the real truth.
Jesus answered, . . . thou canst not follow me now, but thou shalt follow me afterwards--How different from what He said to the Jews: "Whither I go ye cannot come" (John 8:21).

Simon Peter said. For notes on Peter's Denial, see Matthew 26:31-35. Compare Mark 14:29-31; Luke 22:31-34.

Peter saith, Lord, whither goest thou? - St. Peter seems to have thought, that Christ, being rejected by the Jews, would go to some other part of the earth to erect his throne, where he might reign without disturbance, according to the gross notions he had of Christ's kingdom. Thou canst not follow me now - But Peter would not believe him. And he did follow him, John 18:15. But it was afar off. And not without great loss.