The foregoing facts distinctly prove that the exercise of the sexual powers is not indispensable to the health of human beings; that men of all ages can live in full vigorous health without such exercise; and that to the young it is an immense physical advantage that they should so live. This is the important principle to be first established. The subjects of temptation, of customs, of artificial wants, etc., are other questions, to be considered by themselves. Thought will be inevitably confused, and the important practical arrangements of the future hopelessly perplexed, if all sorts of questions are jumbled together; if practical difficulties, social phases, temporary phenomena, are allowed to obscure or completely hide the great guide of humanity--Eternal Truth. A principle clearly established is that portion of truth needed for present guidance. It must be thoroughly understood and resolutely held to, as the only clue which can guide us slowly through the dark labyrinth of error, vice, and misery. Such a guiding principle is found in the essential nature of the human sexual faculty--its distinctive power of self-control. The more this principle is considered, understood, and valued, the more it will be found that it contains the power of purifying society, enlightening legislation, and raising our status as a nation. The aim, therefore, of all wise parents should be to secure those influences which will preserve the purity of their sons until the age of twenty-five, when marriage, as a rule, should be made possible and encouraged. This is the wise practice, derived from experience, applicable to all nations living in temperate climes. Earlier marriage may sometimes be wise, but it is not the broad rule. That the individual may remain in health until a later period and throughout life has been proved, but it is a national loss that the best years of vigorous manhood should not stamp themselves upon the future generation.