Why do you trouble the woman? It is wonderful that Christ, whose whole life was a rule and pattern of temperance and frugality, now approves of immoderate expense, which appears to have been closely allied to luxury and superfluous indulgence. But we must observe the kind of defense which he employs; for he does not maintain that the woman did right, in such a manner as if he wished that the same thing should be done every day, but maintains that what she had done in a single instance was agreeable to God, because it must have been done for a good reason. Though Christ had no desire for the use of the ointment, yet this anointing pleased him on account of the circumstances in which it happened. Hence we infer that certain extraordinary ways of acting are sometimes approved by God, and yet that it would be improper to make them an example. Nor have we any reason to doubt that Mary was led by a secret movement of the Spirit to anoint Christ; as it is certain that, whenever the saints were called to any extraordinary performance, they were led by an unusual movement, so as not to attempt any thing without the guidance and authority of God. There was no precept in existence enjoining on Mary this anointing, nor was it necessary that a law should be laid down for every single action; but as the heavenly calling is the only origin and principle of proper conduct, and as God rejects every thing which men undertake at their own suggestion, Mary was directed by the inspiration of the Spirit, so that this duty, which she performed to Christ, was founded on assured confidence. For she hath performed a good action towards me. By this reply, Christ not merely defended the cause of one woman, but likewise maintained the holy boasting of all who rest satisfied with having themselves and their works approved by God. It will often happen that not only censure, but open condemnation, is pronounced on godly men, who are convinced in their own consciences that what they do is agreeable to the command of God; and it is ascribed to pride, if they set at naught the false judgments of the world, and rest satisfied with being approved by God alone. Since this is a hard temptation, and since it is scarcely possible not to be shaken by the agreement of many people against us, even when they are in the wrong, we ought to hold this doctrine, that none will ever be courageous and steady in acting properly, unless they depend solely on the will of God. And therefore Christ settles here the distinction between what is good and evil by his own solitary decision: for by affirming that what the woman has done is a good action, when that action had been already condemned by the disciples, he represses by this word the rashness of men, who freely allow themselves to pronounce judgment. Relying on this testimony, let us learn to set little value on any reports concerning us that are spread abroad in the world, provided we know that what men condemn God approves. In this manner Isaiah, when oppressed by wicked calumnies, makes reference to God as his voucher, (Isaiah 50:7,) and Paul likewise appeals to the day of the Lord, (1-Corinthians 4:3, 4.) Let us therefore learn to pay no deference to the opinions of men farther than that they may be edified by our example in obedience to God, and when the world rises against us with a loud noise, let us satisfy ourselves with this consolation, that what is reckoned bad on earth is pronounced to be good in heaven.

Trouble ye the woman - That is, disturb her mind by insinuations, as if she had done wrong.
A good work on me - She has done it with a mind grateful, and full of love to me.
The work was good, also, as it was preparative for his death, Matthew 26:12.

Why trouble ye the woman? - Or, Why do ye put the woman to pain? See this sense of κοπους παρεχειν, established by Kypke in loco. A generous mind is ever pained when it is denied the opportunity of doing good, or when its proffered kindness is refused.

(4) When Jesus understood [it], he said unto them, Why trouble ye the woman? for she hath wrought a good work upon me.
(4) We ought not to rashly condemn that which is not orderly done.

When Jesus understood it,.... The indignation of his disciples at this action of the woman's; which he might know, as man, partly by their looks, and partly by their words; though without these, as God, he knew the secret indignation, and private resentment of their minds:
he said unto them, why trouble ye the woman? by blaming her, and censuring the action she had done; as it must, no doubt, greatly trouble her to meet with such treatment from the disciples of Christ: had any of the Pharisees blamed her conduct, it would have given her no pain or uneasiness; but that Christ's own disciples should show indignation at an action done by her from a sincere love to Christ, and to do honour to him, must cut her to the heart: and so it is when either ministers of the Gospel, or private believers, are blamed for their honest zeal in the cause of Christ, by any that profess to love him; this grieves them more than all the enemies of religion say or do unto them:
for she hath wrought a good work upon me; upon his body, by pouring the ointment on it: the Persic version reads it, "according to my mind": it was done, in the faith of him, as the Messiah; it sprung from real and sincere love to him, and was designed for his honour and glory; and so had the essentials of a good work in it. This is the first part of our Lord's defence of the woman: he goes on in the next verse.

Why trouble ye the woman? By your murmurs, as if she had done a sinful thing.
She hath wrought a good work. What is done for Christ from love of Christ is always a good work.