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The Doctrine and Practice of Yoga Including the Practices...

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If you feel heavy in body and brain, if you feel mentally sluggish it is a sure indication that your system is "clogged" with waste matter, due to partial or total inactivity of the physical channels of elimination. You have been indulging in high living and gluttony or you have been indulging in physical gratifications and have thus exhausted the vital fibres of your body. Perhaps you have drunk very little water which is nature's demand for cleaning the vessels of the body. Perhaps you have exercised little and thus the supply of oxygen required for burning off carbon and energising the blood has been rather limited. Mental depression, 'weak nerves,' melancholy, despair, fear, lack of concentration and lots of other mental weakness are due to a clogging of the system with accumulated refuse. In brief, the following are a few of the benefits derivable from scientific fasting:—
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(1) It gives nature a chance to "Clean Up." The day of fasting is a day of physical "house cleaning."
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(2) Like the galvanic battery the body "recuperates" its energies. Strength is invariably restored to one's powers of digestion after a careful fast. No case of dyspepsia, constipation, etc., there is, but can benefit or be totally and radically cured by fasting. Fasting will increase powers of assimilation, quicken hunger, purify and strengthen the nerves and raise your health in all ways.
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(3) By gaining control over appetite you gain control over your lower nature. It is a splendid drill for your Will. You shall gain in spiritual strength. You shall grow positive to your flesh and its cravings. Jesus Christ fasted for 40 days in order to prepare himself to face his great trial and temptation. Our Yogis are all great fasters.

Source attribution

The Doctrine and Practice of Yoga Including the Practices and Exercises of Concentration, both Objective and Subjective, and Active and Passive Mentation, an Elucidation of Maya, Guru Worship, and the Worship of the Terrible, also the Mystery of Will-Force, Project Gutenberg eBook #13300

HEALTH, CHASTITY AND SELF-CONTROL. HOW TO FAST.