Ecclesiastes 3:21

Who knoweth, &c., viz., experimentally; since no one in this life can see a spirit. But as to the spirits of the beasts, which is merely animal, and becomes extinct by the death of the beast, who can tell the manner it acts so as to give life and motion, and by death to descend downward, that is, to be no more? (Challoner) --- Few are able to prove that the soul of man is immortal rather that that of beasts, since the bodies of both are subject to the like inconveniences. The objection is answered [in] chap. xii. 7. (Calmet) --- The difficulty of answering is intimated by "Who?" &c., Psalm xiv. 1. (Menochius)