This section is from the "Nature Cure: Philosophy and Practice Based on the Unity of Disease and Cure" book, by Henry Lindlahr.
Thus Nature Cure brings home to us constantly and forcibly the inexorable facts of natural law and the necessity of compliance with the law. Herein lies its great educational value to the individual and to the race. The man who has learned to master his habits and his appetites so as to conform to Nature's Laws on the physical plane, and who has thereby regained his bodily health, realizes that personal effort and self-control are the Master's Key to all further development on the mental and spiritual planes of being as well; that self-mastery and unremitting and unselfish personal effort are the only means of self-completion, of individual and social salvation.
The naturist who has regained health and strength through obedience to the laws of his being, enjoys a measure of self-content, gladness of soul and enthusiasm which cannot be explained by the mere possession of physical health. These highest and purest attainments of the human soul are not the results of mere physical well-being, but of the peace and harmony which come only from obedience to the law. Such is the peace which passeth understanding.