There should be both inner and outer purity. Bodily purity relates to the physical. It covers such cleansing acts as bathing, wearing clean clothes, eating pure food, and the like. Even in studies, the books should be wholesome and elevating. But mere external cleanliness without internal purity is of no value. Everyone, from the scholar to the common man, is concerned only about external cleanliness and not about the purity of the heart within. However pure the ingredients may be, if the vessel in which they are cooked is not clean, the food will be spoiled. For a man, his heart is the vessel, and he must see that it is kept pure and untainted. For the purification of the heart, everyone must undertake selfless service. Attachments and aversions, which pollute the mind, should be eschewed by concentrating on selfless service. It is only when the heart is pure that selfless service can be performed. Hence both bodily and mental purity are essential for a good devotee.
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