Gregory the Dialogist

Therefore also I will not refrain my mouth. For that man 'refrains his mouth,' that is ashamed to confess the evil he has done. For to put the mouth to labour is to employ it in the confession of sin done, but the righteous man doth 'not refrain his mouth,' in that forestalling the wrath of the searching Judge, he falls wroth upon himself in words of self-confession. Hence the Psalmist saith, Let us come before His Presence with confession. …

Morals on the Book of Job, Book VIII ↗

Thomas Aquinas

After Job showed that the consolation of Eliphaz promising earthly prosperity was inconsistent by arguments, he now shows the same thing by deducing arguments of unfittingness, because if he should rely on that consolation which had been given to him from the hope of earthly prosperity by Eliphaz, as has been shown, it would follow that it would be necessary for him to still remain in sadness, to utter words of sorrow and to despair entirely. This is because Eliphaz's hope is frivolous. …

Commentary on Job ↗