Lest I have bestowed upon you labor in vain. The expression is harsh, and must have filled the Galatians with alarm; for what hope was left to them, if Paul's labor had been in vain? Some have expressed astonishment that Paul should be so powerfully affected by the observance of days, as almost to designate it a subversion of the whole gospel. But if we carefully weigh the whole, we shall see that there was just reason; and that the false apostles not only attempted to lay the yoke of Jewish bondage on the neck of the church, but filled their minds with wicked superstitions. To bring back Christianity to Judaism, was in itself no light evil; but far more serious mischief was done, when, in opposition to the grace of Christ, they set up holidays as meritorious performances, and pretended that this mode of worship would propitiate the divine favor. When such doctrines were received, the worship of God was corrupted, the grace of Christ made void, and the freedom of conscience oppressed. Do we wonder that Paul should be afraid that he had labored in vain, that the gospel would henceforth be of no service? And since that very description of impiety is now supported by Popery, what sort of Christ or what sort of gospel does it retain? So far as respects the binding of consciences, they enforce the observance of days with not less severity than was done by Moses. They consider holidays, not less than the false apostles did, to be a part of the worship of God, and even connect with them the diabolical notion of merit. The Papists must therefore be held equally censurable with the false apostles; and with this addition in aggravation, that, while the former proposed to keep those days which had been appointed by the law of God, the latter enjoin days, rashly stamped with their own seal, to be observed as most holy.

I am afraid of you - I have fears respecting you. His fears were that they had no genuine Christian principle. They had been so easily perverted and turned back to the servitude of ceremonies and rites, that he was apprehensive that there could be no real Christian principle in the case. What pastor has not often had such fears of his people, when he sees them turn to the weak and beggarly elements of the world, or when, after having "run well," he sees them become the slaves of fashion, or of some habit inconsistent with the simplicity of the gospel?

I am afraid of you - I begin now to be seriously alarmed for you, and think you are so thoroughly perverted from the Gospel of Christ, that all my pains and labor in your conversion have been thrown away.

I am afraid of you,.... Which shows the danger he apprehended they were in, by taking such large steps from Christianity to Judaism, and expresses the godly jealousy of the apostle over them; intimates he had some hope of them, and in the whole declares his great love and affection for them; for love is a thing full of care and fear:
lest I have bestowed upon you labour in vain; in preaching the Gospel among them with so much diligence and constancy, though so many afflictions and pressures lay upon him. Faithful ministers of the word are laborious ones; and such an one was the apostle; and who indeed laboured more abundantly than the rest in all places wherever he came; and such will be concerned, as he was, lest their labours should be in vain, not to themselves, but to the souls of others, whose everlasting good and welfare they are seeking. But how is it that the apostle should fear that his labour in preaching the Gospel would be in vain, and become of no effect through their observance of days, months, times, and years? because that hereby the pure spiritual and evangelic worship of God was corrupted, they bringing into it that which God had removed, and so became guilty of will worship; their Christian liberty was infringed, and they brought into bondage, a deliverance from which the Gospel proclaims; the doctrine of free grace in pardon, justification, and salvation, was made void, they observing these things in order to procure them thereby; and it was virtually and tacitly saying, that Christ was not come in the flesh, which is the main article of the Gospel; for since these things had respect to him, and were to continue no longer than till his coming, to keep on the observation of them, was declaring that he was not come; which is in effect to set aside the whole Gospel, and the ministration of it; so that the apostle might justly fear, that by such a proceeding all his labour, and the pains he had took to preach the Gospel, and salvation by Christ unto them, would be in vain.

lest--Greek, "lest haply." My fear is not for my own sake, but for yours.

The apostle here, dropping the argument, applies to the affections, Galatians 4:11-20, and humbles himself to the Galatians, with an inexpressible tenderness.