A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
job 15:2SECOND SPEECH OF ELIPHAZ. (Job 15:1-35)
a wise man--which Job claims to be.
vain knowledge--Hebrew, "windy knowledge"; literally, "of wind" (Job 8:2). In Ecc 1:14, Hebrew, "to catch wind," expresses to strive for what is vain.
east wind--stronger than the previous "wind," for in that region the east wind is the most destructive of winds (Isa 27:8). Thus here,--empty violence.
belly--the inward parts, the breast (Pro 18:8).
job 15:4fear--reverence for God (Job 4:6; Psa 2:11).
prayer--meditation, in Psa 104:34; so devotion. If thy views were right, reasons Eliphaz, that God disregards the afflictions of the righteous and makes the wicked to prosper, all devotion would be at an end.
job 15:5The sophistry of thine own speeches proves thy guilt.
job 15:6No pious man would utter such sentiments.
job 15:7That is, Art thou wisdom personified? Wisdom existed before the hills; that is, the eternal Son of God (Pro 8:25; Psa 90:2). Wast thou in existence before Adam? The farther back one existed, the nearer he was to the Eternal Wisdom.
job 15:8secret--rather, "Wast thou a listener in the secret council of God?" The Hebrew means properly the cushions of a divan on which counsellors in the East usually sit. God's servants are admitted to God's secrets (Psa 25:14; Gen 18:17; Joh 15:15).
restrain--Rather, didst thou take away, or borrow, thence (namely, from the divine secret council) thy wisdom? Eliphaz in this (Job 15:8-9) retorts Job's words upon himself (Job 12:2-3; Job 13:2).
job 15:9in us--or, "with us," Hebraism for "we are aware of."
job 15:10On our side, thinking with us are the aged. Job had admitted that wisdom is with them (Job 12:12). Eliphaz seems to have been himself older than Job; perhaps the other two were also (Job 32:6). Job, in Job 30:1, does not refer to his three friends; it therefore forms no objection. The Arabs are proud of fulness of years.
job 15:11consolations--namely, the revelation which Eliphaz had stated as a consolatory reproof to Job, and which he repeats in Job 15:14.
secret--Hast thou some secret wisdom and source of consolation, which makes thee disregard those suggested by me? (Job 15:8). Rather, from a different Hebrew root, Is the word of kindness or gentleness addressed by me treated by thee as valueless? [UMBREIT].
job 15:12wink--that is, why do thy eyes evince pride? (Pro 6:13; Psa 35:19).
job 15:13That is, frettest against God and lettest fall rash words.
job 15:14Eliphaz repeats the revelation (Job 4:17) in substance, but using Job's own words (see on Job 14:1, on "born of a woman") to strike him with his own weapons.
job 15:15Repeated from Job 4:18; "servants" there are "saints" here; namely, holy angels.
heavens--literally, or else answering to "angels" (see on Job 4:18, and Job 25:5).
job 15:16filthy--in Arabic "sour" (Psa 14:3; Psa 53:3), corrupted from his original purity.
drinketh-- (Pro 19:28).
job 15:17In direct contradiction of Job's position (Job 12:6, &c.), that the lot of the wicked was the most prosperous here, Eliphaz appeals (1) to his own experience, (2) to the wisdom of the ancients.
job 15:18Rather, "and which as handed down from their fathers, they have not concealed."
job 15:19Eliphaz speaks like a genuine Arab when he boasts that his ancestors had ever possessed the land unmixed with foreigners [UMBREIT]. His words are intended to oppose Job's (Job 9:24); "the earth" in their case was not "given into the hand of the wicked." He refers to the division of the earth by divine appointment (Gen 10:5; Gen 25:32). Also he may insinuate that Job's sentiments had been corrupted from original purity by his vicinity to the Sabeans and Chaldeans [ROSENMULLER].
job 15:20travaileth--rather, "trembleth of himself," though there is no real danger [UMBREIT].
and the number of his years, &c.--This gives the reason why the wicked man trembles continually; namely, because he knows not the moment when his life must end.
job 15:21An evil conscience conceives alarm at every sudden sound, though it be in a time of peace ("prosperity"), when there is no real danger (Lev 26:36; Pro 28:1; Kg2 7:6).
job 15:22darkness--namely, danger or calamity. Glancing at Job, who despaired of restoration: in contrast to good men when in darkness (Mic 7:8-9).
waited for of--that is, He is destined for the sword [GESENIUS]. Rather (in the night of danger), "he looks anxiously towards the sword," as if every sword was drawn against him [UMBREIT].
job 15:23Wandereth in anxious search for bread. Famine in Old Testament depicts sore need (Isa 5:13). Contrast the pious man's lot (Job 5:20-22).
knoweth--has the firm conviction. Contrast the same word applied to the pious (Job 5:24-25).
ready at his hand--an Arabic phrase to denote a thing's complete readiness and full presence, as if in the hand.
job 15:24prevail--break upon him suddenly and terribly, as a king, &c. (Pro 6:11).
job 15:25stretcheth . . . hand--wielding the spear, as a bold rebel against God (Job 9:4; Isa 27:4).
job 15:26on his neck--rather, "with outstretched neck," namely, that of the rebel [UMBREIT] (Psa 75:5).
upon . . . bucklers--rather, "with--his (the rebel's, not God's) bucklers." The rebel and his fellows are depicted as joining shields together, to form a compact covering over their heads against the weapons hurled on them from a fortress [UMBREIT and GESENIUS].
job 15:27The well-nourished body of the rebel is the sign of his prosperity.
collops--masses of fat. He pampers and fattens himself with sensual indulgences; hence his rebellion against God (Deu 32:15; Sa1 2:29).
job 15:28The class of wicked here described is that of robbers who plunder "cities," and seize on the houses of the banished citizens (Isa 13:20). Eliphaz chooses this class because Job had chosen the same (Job 12:6).
job 15:29Rather, he shall not increase his riches; he has reached his highest point; his prosperity shall not continue.
perfection--rather, "His acquired wealth--what he possesses--shall not be extended," &c.
job 15:30depart--that is, escape (Job 15:22-23).
branches--namely, his offspring (Job 1:18-19; Psa 37:35).
dry up--The "flame" is the sultry wind in the East by which plants most full of sap are suddenly shrivelled.
his mouth--that is, God's wrath (Isa 11:4).
job 15:31Rather, "let him not trust in vanity or he will be deceived," &c.
vanity--that which is unsubstantial. Sin is its own punishment (Pro 1:31; Jer 2:19).
job 15:32Literally, "it (the tree to which he is compared, Job 15:30, or else his life) shall not be filled up in its time"; that is, "he shall be ended before his time."
shall not be green--image from a withered tree; the childless extinction of the wicked.
job 15:33Images of incompleteness. The loss of the unripe grapes is poetically made the vine tree's own act, in order to express more pointedly that the sinner's ruin is the fruit of his own conduct (Isa 3:11; Jer 6:19).
job 15:34Rather, The binding together of the hypocrites (wicked) shall be fruitless [UMBREIT].
tabernacles of bribery--namely, dwellings of unjust judges, often reprobated in the Old Testament (Isa 1:23). The "fire of God" that consumed Job's possessions (Job 1:16) Eliphaz insinuates may have been on account of Job's bribery as an Arab sheik or emir.
job 15:35Bitter irony, illustrating the "unfruitfulness" (Job 15:34) of the wicked. Their conceptions and birthgivings consist solely in mischief, &c. (Isa 33:11).