It is one of the clearest principles of Divine revelation, that holiness is the fruit of truth; and it is one of the plainest inferences from that principle, that the exhibition of the truth is the best means of promoting holiness. Christians regard the word of God as the only infallible teacher of those truths which relate to the salvation of men. But are the Scriptures really a revelation from God? If they are, what doctrines do they teach? And what influence should those doctrines exert on our heart and life? The publishing committee of the American Sunday School Union have long felt the want of a book which should give a plain answer to these questions, and be suitable to place in the hands of intelligent and educated young persons, either to arouse their attention, or to guide their steps in the way of life. If this little book should be instrumental, by the simple exhibition of the truth, in pointing out the way of life to those who are anxious to know what they must believe and what they must experience in order to be saved, it will answer the design of its preparation and publication.