Charles H. Spurgeon on Psalms 78:39

For he remembered that they were but flesh. They were forgetful of God, but he was mindful of them. He knew that they were made of earthy, frail, corruptible material, and therefore he dealt leniently with them. Though in this he saw no excuse for their sin, yet he constrained it into a reason for mercy; the Lord is ever ready to discover some plea or other upon which he may have compassion. A wind that passeth away, and cometh not again. Man is but a breath, gone never to return. Spirit and wind are in this alike, so far as our humanity is concerned; they pass and cannot be recalled. What a nothing is our life. How gracious on the Lord's part to make man's insignificance an argument for staying his wrath.