Charles H. Spurgeon on Psalms 144:4

Man is like to vanity. When Cain was born, there was much ado about his birth; "I have gotten a man child from God", saith his mother: she looked upon him as a great possession, and therefore called his name Cain, which signifies "a possession." But the second man that was born unto the world bare the title of the world, "vanity"; his name was Abel, that is, "vanity." A premonition was given in the name of the second man what would or should be the condition of all men. In Ps 144:4 there is an allusion unto those two names. We translate it, "Man is like to vanity"; the Hebrew is, "Adam is as Abel"; Adam, you know, was the name of the first man, the name of Abel's father; but as Adam was the proper name of the first, so it is an appellative, or common to all men: now Adam, that is, man of all men, are Abel, vain, and walking in a vain show. —Joseph Caryl.