Why dost thou strive against him? - By refusing to submit to him, and by calling in question his wisdom and goodness.
For he giveth not account of any of his matters - Margin, as in Hebrew "answereth not." The idea is, that it is as useless as it is improper to contend with God. He does his own pleasure, and deals with man as he deems best and right. The reason of his doings he does not state, nor has man any power to extort from him a statement of the causes why he afflicts us. This is still true. The reason of his doings he does not often make known to the afflicted, and it is impossible to know now the causes why he has brought on us the calamity with which we are visited. The general reasons why men are afflicted may be better known now than they were in the time of Elihu, for successive revelations have thrown much light on that subject. But when he comes and afflicts us as individuals; when he takes away a beloved child; when he cuts down the young, the vigorous, the useful, and the pious, it is often impossible to understand why he has done it.
All that we can do then is to submit to his sovereign will, and to believe that though we cannot see the reasons why he has done it, yet that does not prove that there are no reasons, or that we may never be permitted to understand them. We are required to submit to his will, not to our own reason; to acquiesce because he does it, not because we see it to be right. If we always understood the reasons why he afflicts us, our resignation would be not to the will of God, but to our own knowledge of what is right; and God, therefore, often passes before us in clouds and thick darkness to see whether we have sufficient confidence in him to believe that he does right, even when we cannot see or understand the reason of his doings. So a child reposes the highest confidence in a parent, when he believes that the parent will do right, though he cannot understand why he does it, and the parent does not choose to let him know. May not a father see reasons for what he does which a child could not understand, or which it might be proper for him to withhold from him?

Why dost thou strive against him? - Is it not useless to contend with God? Can he do any thing that is not right? As to his giving thee any account of the reasons why he deals thus and thus with thee, or any one else, thou needest not expect it; he is sovereign, and is not to be called to the bar of his creatures. It is sufficient for thee to know that "he is too wise to err, and too good to be unkind."

Why dost thou strive against him? for he giveth not (e) account of any of his matters.
(e) The cause of his judgments is not always declared to man.

Why dost thou strive against him?.... A creature against the Creator, a man against his Maker, the clay against the potter; how absurd and stupid is this! and a piece of weakness and folly it was in him to desire to litigate the point with God, and dispute with him, as he often did, when men cannot answer him one of a thousand, as he himself owned, Job 9:3; and very sinful and criminal it is to chide with God, or complain of him, on account of any of his dealings with the sons of men, as well as it is vain and fruitless:
for he giveth not account of any of his matters; he is a sovereign Being, and does what he pleases in nature, providence, and grace, and is not accountable to any for what he does; in things temporal, he does all after the counsel of his will; he bestows riches and honours, wealth and health, gifts of natural wisdom and knowledge on some, and withholds them from others; and each of these are his own, and he may do with them as he pleases: so likewise in things spiritual, he loves, chooses, redeems, regenerates, calls by his grace, and brings to glory whom he thinks fit; the blessings of grace and glory are his own, and he disposes of them as seems good in his sight; and in all respects he acts according to his will in heaven and in earth; none can stay his hand, or hinder him from doing his pleasure; and none ought to say to him, what dost thou? or why dost thou thus? or, if they do, he is not obliged to give any reasons for his so doing. Some take this to be the thing Job strove and contended with God about, that he did not, and because he did not give an account of all his matters, or answer all his words; and particularly he did not show to him wherefore he contended with him; and others think the meaning is, that God does not reveal all his secrets to men, but only as much as he thinks fit to acquaint them with; secret things belong to him, and things revealed to men; the secrets of his own nature, and the modes of subsistence of the divine Persons in the Godhead, the secret reasons of divine predestination of men to life or death, and of his dealings with men in a providential way, afflicting the righteous, and suffering the wicked to prosper.

(Isaiah 45:9).
his matters--ways. Our part is, not to "strive" with God, but to submit. To believe it is right because He does it, not because we see all the reasons for His doing it.

13 Why hast thou contended against Him,
That He answereth not concerning all His doings?
14 Yet no-in one way God speaketh,
And in two, only one perceiveth it not.
15 In the dream, in a vision of the night,
When deep sleep falleth upon men,
In slumberings upon the bed:
16 Then He openeth the ear of men,
And sealeth admonition for them,
17 That He may withdraw man from mischief,
And hide pride from man;
18 That He may keep back his soul from the pit,
And his life from the overthrow of the sword.
Knowing himself to be righteous, and still considering himself treated as an enemy by God, Job has frequently inquired of God, Why then does He treat him thus with enmity, Job 7:20, and why has He brought him into being to be the mark of His attack? Job 10:18. He has longed for God's answer to these questions; and because God has veiled Himself in silence, he has fallen into complain against Him, as a ruler who governs according to His own sovereign arbitrary will. This is what Elihu has before his mind in Job 33:13. ריב (elsewhere in the book of Job with עם or the acc. of the person with whom one contends) is here, as Jeremiah 12:1 and freq., joined with אל and conjugated as a contracted Hiph. (ריבות instead of רבתּ, Ges. 73, 1); and ענה with the acc. signifies here: to answer anything (comp. Job 32:12; Job 40:2, and especially Job 9:3); the suff. does not refer back to אנושׁ of the preceding strophe (Hirz., Hahn), but to God. דּבריו are the things, i.e., facts and circumstances of His rule; all those things which are mysterious in it He answers not, i.e., He answers concerning nothing in this respect (comp. כל לא, Job 34:27), He gives no kind of account of them (Schnurr., Ges., and others). כּי, Job 33:14, in the sense of imo, is attached to this negative thought, which has become a ground of contention for Job: yet no, God does really speak with men, although not as Job desires when challenged and in His own defence. Many expositors take באחת and בּשׁתּים after lxx, Syr., and Jeremiah., in the signification semel, secundo (thus also Hahn, Schlottm.); but semel is אחת, whereas באחת is nowhere equivalent to בפעם אחת, for in Numbers 10:4 it signifies with one, viz., trumpet; Proverbs 28:18, on one, viz., of the many ways; Jeremiah 10:8, in one, i.e., in like folly (not: altogether, at once, which כּאחד, Syr. bachdo, signifies); then further on it is not twice, but two different modes or means of divine attestation, viz., dreams and sicknesses, that are spoken of; wherefore it is rightly translated by the Targ. una loquela, by Pagn. uno modo, by Vatabl., Merc., una via. The form of the declaration: by one - by two, is that of the so-called number-proverbs, like Job 5:19. In diverse ways or by different means God speaks to mortal man - he does not believe it, it is his own fault if he does perceive it. לא ישׁוּרנּה, which is correctly denoted as a separate clause by Rebia mugrasch, is neither with Schlottm. to be regarded as a circumstantial clause (without one's ), nor with Vatablus and Hahn as a conditional clause (if one does not attend to it), nor with Montanus and Piscator as a relative clause (to him who does not observe it), but with Tremellius as a co-ordinate second predicative clause without a particle (one might expect אך): he (mortal man) or one observes it not (שׁוּר with neut. suff. exactly like Job 35:13).

He - Useth not to give an account to his creatures of the grounds and reasons of his judgments or dispensations as being the supreme governor of all persons and things, in whose will it becometh all men to acquiesce.