4:8-11 The happy change whereby the Galatians were turned from idols to the living God, and through Christ had received the adoption of sons, was the effect of his free and rich grace; they were laid under the greater obligation to keep to the liberty wherewith he had made them free. All our knowledge of God begins on his part; we know him because we are known of him. Though our religion forbids idolatry, yet many practise spiritual idolatry in their hearts. For what a man loves most, and cares most for, that is his god: some have their riches for their god, some their pleasures, and some their lusts. And many ignorantly worship a god of their own making; a god made all of mercy and no justice. For they persuade themselves that there is mercy for them with God, though they repent not, but go on in their sins. It is possible for those who have made great professions of religion, to be afterwards drawn aside from purity and simplicity. And the more mercy God has shown, in bringing any to know the gospel, and the liberties and privileges of it, the greater their sin and folly in suffering themselves to be deprived of them. Hence all who are members of the outward church should learn to fear and to suspect themselves. We must not be content because we have some good things in ourselves. Paul fears lest his labour is in vain, yet he still labours; and thus to do, whatever follows, is true wisdom and the fear of God. This every man must remember in his place and calling.
10. To regard the observance of certain days as in itself meritorious as a work, is alien to the free spirit of Christianity. This is not incompatible with observing the Sabbath or the Christian Lord's day as obligatory, though not as a work (which was the Jewish and Gentile error in the observance of days), but as a holy mean appointed by the Lord for attaining the great end, holiness. The whole life alike belongs to the Lord in the Gospel view, just as the whole world, and not the Jews only, belong to Him. But as in Paradise, so now one portion of time is needed wherein to draw off the soul more entirely from secular business to God (Col 2:16). "Sabbaths, new moons, and set feasts" (1Ch 23:31; 2Ch 31:3), answer to "days, months, times." "Months," however, may refer to the first and seventh months, which were sacred on account of the number of feasts in them.
times—Greek, "seasons," namely, those of the three great feasts, the Passover, Pentecost, and Tabernacles.
years—The sabbatical year was about the time of writing this Epistle, A.D. 48 [Bengel].