Charles H. Spurgeon on Psalms 62:9

Surely men of low degree are vanity, etc. Or, sons of Adam; of the earthly man; of fallen Adam; one of his immediate sons was called Hebel, vanity; and it is true of all his sons, but here it designs only one sort of them; such as are poor and low in the world; mean men, as the phrase is rendered in Isa 2:9; these are subject to sinful vanity; their thoughts are vain, their affections vain, their minds vain, their conversation vain, sinful, foolish, fallacious, and inconstant. John Gill.