IN preparing this edition for the press, I have availed myself largely of the suggestions of many valued friends, and of the criticisms of several unknown reviewers. The materials are entirely re-arranged in many parts the volume is condensed; in some, new matter has been added. I have retained the form of letters because I considered it, on the whole, as well suited as any other for an elder person to convey instruction to a young friend; and admit ting a plainness and familiarity of illustration, which in many parts of the subject seemed necessary. In deference to the advice of those whose judgment I deemed worthy of respect, I have omitted quotations from living preachers, except where I was unable to supply an equivalent illustration.