Book excerpt: There is no subject of more solemn importance to human happiness than prayer. It is the only medium of intercourse with heaven. "It is that language wherein a creature holds correspondence with his Creator; and wherein the soul of a saint gets near to God, is entertained with great delight, and, as it were, dwells with his heavenly Father."1 God, when manifest in the flesh, hath given us a solemn, sweeping declaration, embracing all prayer- private, social, and public-at all times and seasons, from the creation to the final consummation of all things-"God is a Spirit, and they that worship him MUST WORSHIP HIM IN SPIRIT AND IN TRUTH" (John 4:24).