Though thy beginning was small - On the supposition that the children of Job had been cut off, his family now was small. Yet Bildad says, that if he were to begin life again, even with so small a family, and in such depressed and trying circumstances, if he were a righteous man he might hope for returning prosperity.
Yet thy latter end - From this, it is evident that Job was not now regarded as an old man. He would still have the prospect of living many years. Some have supposed, however that the meaning here is, that his former prosperity should appear small compared with that which he would hereafter enjoy if he were pure and righteous. So Noyes and Rosenmuller interpret it. But it seems to me that the former interpretation is the correct one. Bildad utters a general sentiment, that though when a man begins life he has a small family and little property, yet if he is an upright man, he will be prospered and his possessions will greatly increase; compare Job 42:12 : "Yahweh blessed the latter end of Job more than the beginning."

Though thy beginning was small - Thy former state, compared to that into which God would have brought thee, would be small; for to show his respect for thy piety, because thou hadst, through thy faithful attachment to him, suffered the loss of all things, he would have greatly multiplied thy former prosperity, so that thou shouldest now have vastly more than thou didst ever before possess.

Though thy beginning (d) was small, yet thy latter end should greatly increase.
(d) Though the beginning is not as pleasant as you would like, yet in the end you will have sufficient opportunity to please yourself.

Though thy beginning was small,.... When, he first set out in the world; and which though it greatly increased, and he was the greatest man in all the east, yet Bildad suggests, should he behave well, that was comparatively small to what it would be with him hereafter; and which was fact, for he had double of what he before enjoyed; so Mr. Broughton renders the words, "and thy former state should be little to thy latter": or rather the sense and meaning is, "though thy beginning should be small" (r); be it so that it is; or rather that though he should begin again in the world with very little, as indeed at present he had nothing to begin with, and when he did it was but with little; one gave him a piece of money, and another an earring of gold:
yet thy latter end should greatly increase; as it did, for the Lord blessed his latter end, and he had more than at the beginning, even double to what he had in his most flourishing circumstances; see Job 42:11, &c. Bildad seems to have spoken under a spirit of prophecy, without being sensible of it, and not imagining in the least that so it would be in fact; for he only affirms it on supposition of Job's good behaviour for the future, putting it entirely upon that condition, which he had no great expectation of it ever being performed.
(r) "etsi fuerit", so some in Michaelis.

thy beginning--the beginning of thy new happiness after restoration.
latter end-- (Job 42:12; Proverbs 23:18).