Calvin meditates on the response to the glory of God, uniformly throughout the Old Testament.
Hence that dread and amazement with which as Scripture uniformly relates, holy men were struck and overwhelmed whenever they beheld the presence of God. When we see those who previously stood firm and secure so quaking with terror, that the fear of death takes hold of them, nay, they are, in a manner, swallowed up and annihilated, the inference to be drawn is that men are never duly touched and impressed with a conviction of their insignificance, until they have contrasted themselves with the majesty of God. Frequent examples of this consternation occur both in the Book of Judges and the Prophetical Writings; so much so, that it was a common expression among the people of God, “We shall die, for we have seen the Lord.” Hence the Book of Job, also, in humbling men under a conviction of their folly, feebleness, and pollution, always derives its chief argument from descriptions of the Divine wisdom, virtue, and purity. Nor without cause: for we see Abraham the readier to acknowledge himself but dust and ashes the nearer he approaches to behold the glory of the Lord, and Elijah unable to wait with unveiled face for His approach; so dreadful is the sight. And what can man do, man who is but rottenness and a worm, when even the Cherubim themselves must veil their faces in very terror? To this, undoubtedly, the Prophet Isaiah refers, when he says (Isaiah 24:23), “The moon shall be confounded, and the sun ashamed, when the Lord of Hosts shall reign;” i.e., when he shall exhibit his refulgence, and give a nearer view of it, the brightest objects will, in comparison, be covered with darkness.
But though the knowledge of God and the knowledge of ourselves are bound together by a mutual tie, due arrangement requires that we treat of the former in the first place, and then descend to the latter.
Calvin, Instutues, Ch 1 para 3 1584