In writing to the Hebrews (chapters 3 and 4), Paul three times called attention to the words in the ninety-fifth Psalm: "To day if ye will hear his voice, harden not your hearts, as in the provocation, in the day of temptation in the wilderness." To those who feel that they cannot hear God's voice, as well as to those who have a sense of impaired hearing, these words come to arouse thought and bring assurance of man's indestructible hearing.
It is comforting to know that God directs, and that we can hear His directing voice when fear and human will are silenced. In the degree that one corrects the habit of procrastination, the postponing of opportunities for spiritual growth, he begins to realize more of the immediacy of good. As he accepts wholeheartedly the teaching of Christian Science that salvation is attainable now, through gaining the Mind of Christ, and begins to prove this fact in his life, hearing and the other faculties are improved.
The admonition, "Harden not your hearts," may mean to avoid arbitrary human opinions or the tendency to indulge in stubborn, unyielding human will. It may also mean to avoid selfishness, indifference, or stern judgment, and it implies that one should be compassionate. A searching of the heart often reveals other false mental states that would obstruct hearing. Many times an individual may not hear God's voice, because he is listening to his own preconceptions and not to the thoughts of God. When Jesus healed deafness, he cast out the deaf spirit—that unhearing, unlistening sense—and revealed the spiritual senses of man as ever attentive to the voice, or will, of God.
