John 2:17

"They," His disciples, it says, "Remembered that it is written, The zeal of thine house hath eaten me up." But the Jews did not remember the Prophecy, and said, "What sign showest Thou unto us?" both grieving that their shameful traffic was cut off, and expecting by these means to stop Him, and also desiring to challenge Him to a miracle, and to find fault with what He was doing.

"Then the disciples remembered that it was written, The zeal of Thine house hath eaten me up:" because by this zeal of God's house, the Lord cast these men out of the temple. Brethren, let every Christian among the members of Christ be eaten up with zeal of God's house. Who is eaten up with zeal of God's house? He who exerts himself to have all that he may happen to see wrong there corrected, desires it to be mended, does not rest idle: who if he cannot mend it, endures it, laments it. The grain is not shaken out on the threshing-floor that it may enter the barn when the chaff shall have been separated. If thou art a grain, be not shaken out from the floor before the putting into the granary; lest thou be picked up by the birds before thou be gathered into the granary. For the birds of heaven, the powers of the air, are waiting to snatch up something off the threshing-floor, and they can snatch up only what has been shaken out of it. Therefore, let the zeal of God's house eat thee up: let the zeal of God's house eat up every Christian, zeal of that house of God of which he is a member. For thy own house is not more important than that wherein thou hast everlasting rest. Thou goest into thine own house for temporal rest, thou enterest God's house for everlasting rest. If, then, thou busiest thyself to see that nothing wrong be done in thine own house, is it fit that thou suffer, so far as thou canst help, if thou shouldst chance to see aught wrong in the house of God, where salvation is set before thee, and rest without end? For example, seest thou a brother rushing to the theatre? Stop him, warn him, make him sorry, if the zeal of God's house doth eat thee up. Seest thou others running and desiring to get drunk, and that, too, in holy places, which is not decent to be done in any place? Stop those whom thou canst, restrain whom thou canst, frighten whom thou canst, allure gently whom thou canst: do not, however, rest silent. Is it a friend? Let him be admonished gently. Is it a wife? Let her be bridled with the utmost rigor. Is it a maid-servant? Let her be curbed even with blows. Do whatever thou canst for the part thou bearest; and so thou fulfillest, "The zeal of Thy house hath eaten me up." But if thou wilt be cold, languid, having regard only to thyself, and as if thyself were enough to thee, and saying in thy heart, What have I to do with looking after other men's sins? Enough for me is the care of my own soul: this let me keep undefiled for God;-come, does there not recur to thy mind the case of that servant who hid his talent and would not lay it out? Was he accused because he lost it, and not because he kept it without profit? So hear ye then, my brethren, that ye may not rest idle. I am about to give you counsel: may He who is within give it; for though it be through me, it is He that gives it. You know what to do, each one of you, in his own house, with his friend, his tenant, his client, with greater, with less: as God grants an entrance, as He opens a door for His word, do not cease to win for Christ; because you were won by Christ.

(Tr. x. c. 9) He then is eaten up with zeal for God's house, who desires to correct all that he sees wrong there; and, if he cannot correct, endures and mourns. In thine house thou busiest thyself to prevent matters going wrong; in the house of God, where salvation is offered, oughtest thou to be indifferent? Hast thou a friend? admonish him gently; a wife? coerce her severely; a maid-servant? even compel her with stripes. Do what thou art able, according to thy station.

(in loc.) His disciples seeing this most fervent zeal in Him, remembered that it was from zeal for His Father's house that our Saviour drove the ungodly from the temple.

Zeal, taken in a good sense, is a certain fervour of the Spirit, by which the mind, all human fears forgotten, is stirred up to the defence of the truth. To take the passage mystically, God enters His Church spiritually every day, and marks each one's behaviour there. Let us be careful then, when we are in God's Church, that we indulge not in stories, or jokes, or hatreds, or lusts, lest on a sudden He come and scourge us, and drive us out of His Church.