"We scarcely need add further evidence of the fearful extent of this evil, but will conclude with the following:- “The pernicious and debasing practice of masturbation is a more common and extensive evil with youth of both sexes than is usually supposed.” “A great number of the evils which come upon the youth at and after the age of puberty, arise from masturbation, persisted in, so as to waste the vital energies and enervate the physical and mental powers of man.” “Many of the weaknesses commonly attributed to growth and the changes in the habit by the important transformation from adolescence to manhood, are justly referable to this practice.""
January 1, 1970
https://en.wikiquote.org/wiki/John_Harvey_Kellogg