Gregory the Dialogist

Neither is there any that is able to convict both of us, and to lay his hand upon us both. It sounds hard that any should be sought who might convict God, but it will not be hard, if we recall to mind what He Himself says by another Prophet; for He charges us by Isaiah, Cease to do evil, learn to do well. Seek judgment, relieve the oppressed, judge the fatherless, plead for the widow. Come, and convict Me, saith the Lord. For one whom we convict, we encounter with the authority of reason. …

Morals on the Book of Job, Book IX ↗

Thomas Aquinas

For when two men contend with each other, they can have a judge who examines both arguments. But there can be no arbiter between God and man for two reasons. One reason is because a judge must have a higher wisdom which is like the standard according to which the arguments of both parties are examined. It is clear, however, that divine wisdom is the first standard according to which the truth of all things is examined. …

Commentary on Job ↗

Bonaventure

Friendship with God man could not recover except through a fitting mediator, who could lay his hand upon both and be conformed to each party and a friend to each, and therefore, as he is like God through his Divinity, so like man through his humanity.

Breviloquium ↗