Charles H. Spurgeon on Psalms 27:8

My heart said unto thee. The heart is between God and our obedience, as it were, an ambassador. It understands from God what God would have done, and then it lays a command upon the whole man. The heart and conscience of man is partly divine, partly human. It hath some divinity in it, especially if the man be a holy man. God speaks, and the heart speaks. God speaks to the heart, and the heart speaks to us. And ofttimes when we hear conscience speaking to us, we neglect it; and as St. Augustine said of himself, "God spake often to me, and I was ignorant of it." When there is no command in the word that the heart directly thinks of (as indeed many profane careless men scarce have a Bible in their houses), God speaks to them thus; conscience speaks to them some broken command, that they learn against their wills. They heed it not, but David did not so. God said, Seek ye my face: his heart answers, "Thy face, Lord, will I seek." The heart looks upward to God, and then to itself, My heart said. It said to thee and then to itself. First, his heart said to God, "Lord, I have encouragement from thee. Thou hast commanded that I should seek thy face." So his heart looked to God, and then it speaks to itself. Thy face, Lord, will I seek. It looks first to God, and then to all things that come from itself. Richard Sibbes.