"If a writer be conscious that to gain a reception for his favourite doctrine he must combat with certain elements of opposition, in the taste, or the pride, or the indolence of those whom he is addressing, this will only serve to make him the more importunate. There is a difference between such truths as are merely of a speculative nature and such as are allied with practice and moral feeling. With the former all repetition may be often superfluous; with the latter it may just be by earnest repetition, that their influence comes to be thoroughly established over the mind of an inquirer."—Chalmers.