Gregory the Dialogist

Then call Thou, and I will answer; or let me speak, and answer Thou me. Who at the time, when He did appear by the assumption of the flesh to the eyes of mankind, disclosed to men their sins, which they were doing and knew not. Though the 'calling' and 'answering' may likewise be understood in another way. For God's 'calling' us is His having respect to us in loving and choosing us, and our 'answering' is the yielding obedience to His love by good works. Where it is fitly added, Or let me speak, and answer Thou me. …

Morals on the Book of Job, Book XI ↗

Thomas Aquinas

Now a debate is between two persons: namely, the one making objections and the other one answering them. So, in entering a dispute with God, he gives him the option of choosing which role he wants to take: the one making objections or the one answering. He therefore says, "Call me and I will answer you," saying in effect: You object and I will answer. …

Commentary on Job ↗