The plan of the following course of Lectures was suggested to the author, by his having often felt the need of a book to put into the hands of the young, which would yield them counsel and instruction adapted to every variety of circumstances. Such a book he has here attempted to supply-a book designed to guard the moral principles and habits of youth, amidst the temptations of the world; to impress them with the infinite obligations and advantages of true religion; to conduct them through that most interesting period of anxious inquiry concerning their salvation; to bring them to a cordial acceptance of the gospel offer; to assist them in ascertaining their claims to the Christian character; and to enable them to prosecute the various duties and conflicts of the Christian life, in such a manner that they may finish their course with joy. Several of these lectures were written during the author's connection with his late charge at West-Springfield, and the whole course was originally intended especially for the benefit of the youth of that congregation. Since his connection with his present charge, he has completed the course; and the several lectures embraced in it have been delivered in the hearing of the youth to whom he now ministers: and it is in compliance with a respectful and affectionate request from them, as well as in accordance with his original design, that the series is now given to the public.