(20) So mightily grew the word of God and prevailed.—The verbs imply a continuous growth. The better MSS. give, “the word of the Lord.”

19:13-20 It was common, especially among the Jews, for persons to profess or to try to cast out evil spirits. If we resist the devil by faith in Christ, he will flee from us; but if we think to resist him by the using of Christ's name, or his works, as a spell or charm, Satan will prevail against us. Where there is true sorrow for sin, there will be free confession of sin to God in every prayer and to man whom we have offended, when the case requires it. Surely if the word of God prevailed among us, many lewd, infidel, and wicked books would be burned by their possessors. Will not these Ephesian converts rise up in judgement against professors, who traffic in such works for the sake of gain, or allow themselves to possess them? If we desire to be in earnest in the great work of salvation, every pursuit and enjoyment must be given up which hinders the effect of the gospel upon the mind, or loosens its hold upon the heart.So mightily grew the word of God - So powerfully. It had such efficacy and power in this wicked city. That power must have been mighty which would thus make them willing not only to cease to practice imposition, but to give up all hopes of future gains, and to destroy their property. On this instructive narrative we may remark:

(1) That religion has power to break the hold of sinners on unjust and dishonest means of living.

(2) that those who have been engaged in an unchristian and dishonorable practice will abandon it when they become Christians.

(3) that their abhorrence of their former course will be, and ought to be, expressed as publicly as was the offence.

(4) that the evil practice will be abandoned at any sacrifice, however great. The question will be, what is right; not what will it cost. Property, in the view of a converted man, is nothing when compared with a good conscience.

(5) this conduct of those who had used curious arts shows us what ought to be done by those who have been engaged in any evil course of life and who are then converted. If what they did when they were converted was right - and who can doubt it? - it settles a great principle on which young converts should act. If a man has been engaged in the slave-trade, he will abandon it, and his duty will not be to sell his ship to one who he knows will continue the traffic. His property should be withdrawn from the business publicly, either by being destroyed, or by being converted to a useful purpose. If a man has been a distiller of ardent spirits as a drink, his duty will be to forsake his evil course. Nor will it be his duty to sell his distillery to one who will continue the business, but to withdraw his property from it publicly, either by destroying it, or converting it to some useful purpose. If a man has been engaged in the traffic in ardent spirits, his duty is not to sell his stock to those who will continue the sale of the poison, but to withdraw it from public use - converting it to some useful purpose, if he can; if not, by destroying it. All that has ever been said by money-loving distillers, or venders of ardent spirits, about the loss which they would sustain by abandoning the business, might have been said by these practitioners of curious arts in Ephesus. And if the excuses of rumselling people are valid, their conduct was folly; and they should either have continued the business of practicing "curious arts" after they were converted, or should have sold their "books" to those who would have continued it. For assuredly it was not worse to practice jugglery and fortune-telling than it is to destroy the bodies and souls of people by the traffic in ardent spirits. And yet, how few people there are in Christian lands who practice on the principle of these honest, but comparatively unenlightened men at Ephesus.

19. Many of them … which used curious arts—The word signifies things "overdone"; significantly applied to arts in which laborious but senseless incantations are practiced.

brought their books—containing the mystic formularies.

and burned them before all—The tense, here used graphically, expresses progress and continuance of the conflagration.

counted the price … and found it fifty thousand pieces of silver—about £2000 (presuming it to be the drachma, the current coin of the Levant, of about 10d. value). From their nature they would be costly, and books then bore a value above any standard we are familiar with. The scene must have been long remembered at Ephesus, as a strong proof of honest conviction on the part of the sorcerers and a striking triumph of Jesus Christ over the powers of darkness. The workers of evil were put to scorn, like Baal's priests on Carmel, and the word of God mightily grew and prevailed [Howson].

The increase which the seed of the word had made was very remarkable; or it is a great instance of the power of God’s word, when it makes men willing to part with their beloved and accustomed sins, and not to stand upon saving or gaining; as Isaiah 55:11.

So mightily grew the word of God, and prevailed. Over conjuring books, conjurers themselves, yea, even the devils; the power of God going along with it, many were converted; which is meant by the increase of it, and were delivered from the power of darkness, out of the hands of Satan, and translated into the kingdom of Christ. Beza's ancient copy reads, the "faith" of God; and the Syriac version, "faith in God". So mightily grew the word of God and prevailed.