Jesus said, “This voice was for your benefit, not mine.
The ironic thing is that the voice, which was heard so poorly, was not for the benefit of Jesus, but for those who did not hear what it said. Since the voice was for the benefit of the crowd, why did they not understand it? Because they weren’t listening. Their preconceived ideas that God would not speak to them kept them from hearing.
Note that when God speaks, the value to the listener of what He said is directly proportional to their ability to hear. How is your spiritual hearing? Are you listening?