A hard heart keeps us from perceiving spiritual truths and stops us from understanding. When a person doesn’t understand God’s Word, Satan finds no resistance when he comes to steal it away. A hard heart keeps us from remembering. This isn’t to say that facts or scriptures can’t be recalled, it’s the spiritual lessons learned that have been forgotten. Likewise, some people can quote scripture or remember what the sermon was about, but they can’t perceive the spiritual life in it or retain what they did perceive, because of a hardened heart.

Jesus didn’t need to hear this audible voice of God because he had a more sure word of prophecy than the audible voice of God from heaven (2 Pet. 1:18-20). Jesus knew the ‘voice’ of the Old Testament scriptures that spoke of the Christ being glorified and He could also hear the Father’s voice in His heart as He had on so many other occasions. This audible voice didn’t come to reassure Jesus, but it came to those who had ears to hear, so that they might believe.