John Calvin Commentary Psalms 90:7

"For we are consumed in thine anger, And in thy wrath are we troubled." — Psalms 90:7 (ASV)

For we fail by thy anger. Moses deliberately mentions God's anger, for it is necessary for people to be deeply affected by this, so that they will seriously consider what experience compels them to acknowledge: how quickly they finish their course and pass away.

He had, however, still another reason for connecting the brevity of human life with God's anger. While people are by nature so transitory and, as it were, shadowy, the Israelites were afflicted by God's hostile hand; and His anger is less bearable for our frail natures, which quickly vanish away, than it would be if we possessed some reasonable degree of strength.