Jamieson, Fausset & Brown, on Eccl 3:21

“Who knoweth if the spirit of the children of Adam ascend upward, and if the spirit of the beasts descend downward?”

“Who knoweth--Not doubt of the destination of man's spirit (Ecc 12:7); but "how few, by reason of the outward mortality to which man is as liable as the beast and which is the ground of the skeptic's argument, comprehend the wide difference between man and the beast" (Isa 53:1). The Hebrew expresses the difference strongly, "The spirit of man that ascends, it belongeth to on high; but the spirit of the beast that descends, it belongeth to below, even to the earth." Their destinations and proper element differ utterly [WEISS].”

Imported from an open dataset — not yet checked against the printed edition.