Psalms 90:5

5Thou carriest them away as with a flood. Moses confirms what he had previously said, That men, so long as they are sojourners in this world, perform, as it were, a revolution which lasts only for a moment. I do not limit the expression to carry away as with a flood to calamities of a more grievous kind, but consider that death is simply compared in general to a flood; for when we have staid a little while in the world, we forthwith fall into the grave and are covered with earth. Thus death, which is common to all, is with propriety called an inundation. While we are breathing the breath of life, the Lord overflows us by death, just as those who perish in a shipwreck are engulfed in the ocean; so that death may be fitly called an invisible deluge. And Moses affirms, that it is then evidently seen that men who flatter themselves that they are possessed of wonderful vigor in their earthly course, are only as a sleep. The comparison of grass which is added, amounts to this, That men come forth in the morning as grass springs up, that they become green, or pass away within a short time, when being cut down, they wither and decay. The verbs in the 6th verse being in the singular number, it is better to connect them with the word grass. But they may also be appropriately referred to each man; and as it makes little difference as to the sense of the text, whether we make grass or each man the nominative to the verbs, I am not disposed to expend much labor upon the matter. This doctrine requires to be continually meditated upon; for although we all confess that nothing is more transitory than our life, yet each of us is soon carried away, as it were, by a frantic impulse to picture to his own imagination an earthly immortality. Whoever bears in mind that he is mortal, restrains himself, that instead of having his attention and affections engrossed beyond measure with earthly objects, he may advance with haste to his mark. When we set no limit to our cares, we require to be urged forward by continual goadings, that we may not dream of a thousand lives instead of one, which is but as a shadow that quickly vanishes away.