Jamieson, Fausset and Brown on Job 34:14-15

14-15. "If He were to set His heart on man," either to injure him, or to take strict account of his sins. The connection supports rather [Umbreit], "If He had regard to himself (only), and were to gather unto Himself (Psa 104:29) man's spirit, &c. (which he sends forth, Psa 104:30; Ec 12:7), all flesh must perish together," &c. (Ge 3:19). God's loving preservation of His creatures proves He cannot be selfish, and therefore cannot be unjust.