One of the first verses in the Bible is about hearing concerns Adam, Gen.3:17 And unto Adam he said, Because thou hast hearkened unto the voice of thy wife, and hast eaten of the tree, of which I commanded thee, saying, Thou shalt not eat of it: cursed is the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life… And all through the Old Testament we find that the ears to hear and the heart to understand in man has been severely damaged. David even picks it up on the Psalms 115:6 They have ears, but they hear not: noses have they, but they smell not: In proverbs 8:33 even Solomon picks up the cry: “Hear instruction, and be wise, and refuse it not. Christ Jesus in Matt.13:12-14 went on to teach:”
So one of the most important factors in a Christian life is to HEAR the WORD of GOD clearly in the HEART, and in humility, obey it.
Abraham is an exceptional example of this. He was so sure of the voice that he heard in his heart that he was willing to take his miracle Son of his old age up on a mountain and make him a sacrifice to the God that he heard in his heart. We all know the story, but do we realize how strong his contact with GOD must have been. How clear was his hearing… And also to pack up his family being sure of the same voice and leaving his land to go where he had no idea of where he was going. Heb.11 is a short record of how HEART FAITH works when the voice of GOD is clear and obeyed.
One of my favorite versed on this subject is James:4:8-10