Adam Clarke Bible Commentary
And thou shalt be secure - Thou shalt not fear any farther evils to disturb thy prosperity, for thou shalt have a well-grounded hope and confidence that thou shalt no more be visited by adversity.
Yea, thou shalt dig - I believe this neither refers to digging his grave, nor to curiously investigating surrounding circumstances; but to the custom of digging for water in the places where they pitched their tents. It was a matter of high importance in Asiatic countries to find good wells of wholesome water; and they were frequently causes of contention among neighboring chiefs, who sometimes stopped them up, and at other times seized them as their own. Through envy of Isaac's prosperity the Philistines stopped up all the wells which Abraham had digged, Gen 26:12-16. And we find the herdsmen of Gerar contending with Isaac's servants about the wells which the latter had digged; so that they were obliged to abandon two of the chief of them, and remove to a distance in order to dig and find quiet possession. See Gen 31:17-22. Zophar, in reference to all these sorts of contentions and petty wars about wells and springs, tells Job that in the state of prosperity to which he shall be brought by the good providence of God, he shall dig - find wells of living water; none shall contend with him; and he shall rest in safety, all the neighboring chieftains cultivating friendship with him; see on Job 5:23 (note), Job 5:24 (note); and that this is the meaning of the passage the following verse shows: Thou shalt lie down, and none shall make thee afraid; yea, many shall make suit unto thee. Thou shalt be in perfect security; no enemy shall molest thee, and many shall seek thy friendship.
Jamieson-Fausset-Brown Bible Commentary
The experience of thy life will teach thee there is hope for man in every trial.
dig--namely, wells; the chief necessity in the East. Better, "though now ashamed (Rom 5:5, opposed to the previous 'hope'), thou shalt then rest safely" [GESENIUS];
John Gill Bible Commentary
And thou shall be secure,.... From coming into like darkness, difficulties, and distress again, and from every evil and enemy; nothing shall come nigh to disturb and hurt, nothing to be feared from any quarter, all around: or "shalt be confident" (y); have a strong faith and full assurance of it, in the love of God, in the living Redeemer, and in the promises which respect the life that now is, and that which is to come:
because there is hope; of the mercy of God, of salvation by Christ, and of eternal glory and happiness, as well as of a continuance of outward prosperity; faith and hope mutually assist each other; faith is the substance of things hoped for, and hope of better and future things on a good foundation encourages faith and confidence:
yea, thou shalt dig about thee; to let in stakes for the pitching and fixing of tents to dwell in, and for more commodious pasturage; or for wells of water, for the supply both of the family and the flocks; or rather, for ditches and trenches to secure from thieves and robbers, or for drains to carry off floods of water:
and thou shalt take thy rest in safety; lie down on the bed and sleep in the night season in peace and quietness, having nothing to fear; being well entrenched, and secure from depredations and inundations; and, more especially being hedged about and protected by the power and providence of God; see Psa 3:5; the Targum is,
"thou shall prepare a grave, and lie down, and sleep secure.''
(y) "et confides", Mercerus, Piscator, Schmidt; "et habebis fiduciam", V. L.