Galatians 4:11

Paul knew that, with reference to himself, he had not laboured in vain; he might say with Isaiah, Isaiah 49:5: Though Israel be not gathered, yet shall I be glorified. He had told the Corinthians, that he knew he should be a sweet savour to God, as well in them that perished as in them that should be saved, 2 Corinthians 2:15. But he speaks with reference to them. A faithful minister accounteth his labour lost when he seeth no fruits of it upon the souls of his people. Nor was Paul afraid of this as to the sincerer part of this church, who truly believed, and were justified, but he speaketh this with reference to the whole body of this church. That which he feared, was their falling back from their profession of Christianity to Judaism; as judging the observation of the Jewish days necessary by Divine precept to Christians. Nor doth he speak of the observation of such days, as it was their duty in obedience to the moral law to observe, which commandeth the observation of a seventh day for the weekly sabbath, and gives a liberty for setting apart other days, and the commanding the observation of them, to take notice of and acknowledge God in emergent providences. But he only speaks of days imposed by the ceremonial law, and men's religious observation of them, as being tied to it by a Divine precept, by which they made them a part of worship. We have a liberty to set apart any day for God's worship, and magistrates have a liberty to set apart particular days for the acknowledgment of God in emergent providences whether of mercy or judgment; but none hath a power to make a day holy, so as that it shall be a sin against God for all to labour therein, much less hath any a liberty to keep Jewish holy-days.