19. _As many as I love, I rebuke and chasten._ Of course, only on the supposition that they deserve it. The meaning is, that it is a proof of love on his part, if his professed friends go astray, to recall them by admonitions and by trials. So a father calls back his children who are disobedient; and there is no higher proof of his love than when, with great pain to himself, he administers such chastisement as shall save his child. See the sentiment here expressed fully explained in the Notes on He. xii. 6, seq. The language is taken from Pr. iii. 12. ¶ _Be zealous, therefore, and repent._ Be earnest, strenuous, ardent in your purpose to exercise true repentance, and to turn from the error of your ways. Lose no time; spare no labour, that you may obtain such a state of mind that it shall not be necessary to bring upon you the severe discipline which always comes on those who continue lukewarm in religion. The _truth_ taught here is, that when the professed followers of Christ have become lukewarm in his service, they should lose no time in returning to him, and seeking his favour again. As sure as he has any true love for them, if this is not done he will bring upon them some heavy calamity, alike to rebuke them for their errors, and to recover them to himself. 20 Behold, I stand at the door, and [169]knock: [170]if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me. 20. _Behold, I stand at the door, and knock._ Intimating that, though they had erred, the way of repentance and hope was not closed against them. He was still willing to be gracious, though their conduct had been such as to be loathsome, ver. 16. To see the real force of this language, we must remember how disgusting and offensive their conduct had been to him. And yet he was willing, notwithstanding this, to receive them to his favour; nay more, he stood and pled with them that he might be received with the hospitality that would be shown to a friend or stranger. The _language_ here is so plain that it scarcely needs explanation. It is taken from an act when we approach a dwelling, and, by a well-understood sign――_knocking_――announce our presence, and ask for admission. The act of _knocking_ implies two things: (a) that we desire admittance; and (b) that we recognize the right of him who dwells in the house to open the door to us or not, as he shall please. We would not obtrude upon him; we would not force his door; and if, after we are sure that we are heard, we are not admitted, we turn quietly away. Both of these things are implied here by the language used by the Saviour when he approaches man as represented under the image of knocking at the door: that he _desires_ to be admitted to our friendship; and that he recognizes our _freedom_ in the matter. He does not obtrude himself upon us, nor does he employ force to find admission to the heart. If admitted, he comes and dwells with us; if rejected,