Augustine of Hippo
The Lord proclaimed from on high. What other person can be envisioned as the one to whom these words are directed: Hear, My people, My law? Now, we find that man has indeed spoken, and these messages have been passed down to us through our ancestors. Clearly, God intends to communicate through the human ministry, as the Apostle reveals: “Do you want to receive the proof of Him who spoke in me, Christ?” (2 Cor. 13:3). He willed that His words should be declared, ensuring that the individual who conveys them is not treated with contempt simply because he is human. This parallels the manner in which God's voice reaches us through our physical senses.
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The Creator influences His creation through unseen means, ensuring that the essence remains unchanged and is not made into something transient or material. Instead, He employs both tangible and perceptible signs—sights and sounds—as much as human limitations allow to convey His will.
Just as an angel can interact with air, fog, clouds, fire, and other natural elements, or a person can express thoughts using their face, voice, hands, pen, or written words to convey hidden insights, so too does God, who governs all creation, use both angels and humans to communicate His desires. Consider how a human emissary can command another to go here or there, or instruct a servant to accomplish tasks (Luke 7:8). With what greater authority and power does God accomplish this, for He is the Lord to whom all things submit? These divine revelations were heard in the Old Testament and are now understood in the New Testament—heard when they were prophesied and recognized when they came to pass. Where promises are fulfilled, the listener is assured of the truth. Our ancestors, Moses and the Prophets, have faithfully informed us.