Albert Barnes Commentary Job 14:21

"His sons come to honor, and he knoweth it not; And they are brought low, but he perceiveth it not of them." — Job 14:21 (ASV)

His sons come to honour, and he knoweth it not - He is unaware of what is happening on earth. Even should that which is most gratifying to a parent’s heart occur; should his children rise to stations of honor and influence, he would not be permitted to enjoy the happiness that every father feels when his sons do well. This is suggested as one of the evils of death.

They are brought low, but he perceiveth it not of them - He is not permitted to sympathize with them or to sustain them in their trials. This is another of the evils of death. When his children need his counsel and advice, he is not permitted to give it. He is taken away from his family and revisits them no more.