Thou shalt also decree a thing, and it shall be established unto thee - Thou shalt form a purpose or plan, and it shall not be frustrated. It shall not be opposed by the events of divine Providence, but whatever you undertake shall prosper.
And the light shall shine upon thy ways - Thou shalt be prospered in all things, instead of being overtaken with calamity.

Thou shalt also decree a thing - Whatsoever thou purposest in his strength, thou shalt be enabled to accomplish.

Thou shalt also decree a thing, and it shall be established unto thee: and the (t) light shall shine upon thy ways.
(t) That is, the favour of God.

Thou shalt also decree a thing, and it shall be established unto thee,.... Strictly speaking, this is only true of God, whose decrees are unfrustrable, whose counsel shall stand, and the thoughts of his heart be established to all generations; and frequently so it is, according to an usual saying, man appoints, but God disappoints; this may be understood of Job, either as a civil magistrate, that he should decree a thing in a court of judicature with so much wisdom and equity, that it should stand firm and sure, and, though made on earth, should be ratified in heaven, as the decrees and doctrines of the apostles of Christ are said to be, Matthew 16:19; see Proverbs 8:15; or, as a private man in civil affairs, signifying that he should be so guided by the Lord, and prospered and succeeded in all his ways and works, that what he determined to do, and formed a scheme for the execution of, it should be brought about and confirmed; he committing his ways to the Lord, his thoughts should be established, or his purposes and designs effected, see Psalm 1:3; or rather as a praying man; and so it agrees with what goes before, that he should lift up his voice to God, and pray unto him with success, and have just occasion to praise him, or pay his vows to him, since he should have the desires of his heart; whatever was upon his mind, and he prayed in faith for, he should have it; as Elijah prayed, both that it might not rain, and that it might rain, and both were according to his word, or the decree of his lips in prayer: see 1-Kings 17:1;
and the light shall shine upon thy ways; which is the reason of all things prospering and succeeding, and being established according to his wish and will; the light of grace shining in him, to put him upon and instruct him in denying and avoiding that which is sinful, and doing that which was just and good; and the light of the word without him, being a light unto his feet, and a lamp to his paths, to guide and direct him, and especially the light of God's favour and blessing on him, succeeding him in all his ways and works, and making them prosperous.

light--success.

Established - Thy purposes shalt not be disappointed, but ratified by God. And in all thy counsels, and actions, God shall give thee the light of his direction and governance, and of comfort and success.