The apostle comes in these words to instruct and establish Christians in the truth of the coming of the Lord, where we may clearly discern the tenderness and affection wherewith he speaks to them, calling them beloved; he had a compassionate concern and a love of good-will for the ungodly wretches who refused to believe divine revelation, but he has a peculiar respect for the true believers, and the remaining ignorance and weakness that the apprehends to be in them make him jealous, and put him on giving them a caution. Here we may observe,
I. The truth which the apostle asserts—that with the Lord one day is as a thousand years, and a thousand years are as one day. Though, in the account of men, there is a great deal of difference between a day and a year, and a vast deal more between one day and a thousand years, yet in the account of God, who inhabits eternity, in which there is no succession, there is no difference; for all things past, present, and future, are ever before him, and the delay of a thousand years cannot be so much to him as the deferring of any thing for a day or an hour is to us.
II. The importance of this truth: This is the one thing the apostle would not have us ignorant of; a holy awe and reverential fear of God are necessary in order to our worshiping and glorifying him, and a belief of the inconceivable distance between him and us is very proper to beget and maintain that religious fear of the Lord which is the beginning of wisdom. This is a truth that belongs to our peace, and therefore he endeavours that it may not be hidden from our eyes; as it is in the original, Let not this one thing be hidden from you. If men have no knowledge or belief of the eternal God, they will be very apt to think him such a one as themselves. Yet how hard is it to conceive of eternity! It is therefore not very easy to attain such a knowledge of God as is absolutely necessary.