Gregory the Dialogist

Thou shalt also decree a thing, and it shall be established unto thee. This is used to be the special conclusion of those going weakly, that in such proportion they esteem a man righteous as they see him obtain all that he desires; whereas in truth we know that earthly goods are sometimes withheld from the righteous, while they are bestowed with liberal bounty upon the unrighteous; seeing that to sick persons also when they are despaired of, physicians order whatever they call for to be supplied, but those whom they foresee may be …

Morals on the Book of Job, Book XVI ↗

Thomas Aquinas

Then he promises success and prosperity in all his plans when he says, "You will decide on a matter," that is, you will order by your own providence how something will be, "and it will come to you," for your hope will not be in vain. Lest you hesitate about what should be decided, what means you should use will be clear to you, and so he then says, "and light will shine on your ways," that is, it will appear clearly to you by what ways you should proceed.

Commentary on Job ↗