This section is from the "May I Answer That?" book, by Sri Swami Sivananda. Also available from Amazon: May I Answer That?
From time immemorial, Mother Ganges has been associated with sages and saints who had found immense spiritual benefit by bathing in her waters as well as by drinking it.
Fire can burn all other things, but cannot act upon its own self. Flowing down the Himalayan ranges which contain many a rare herb that possess disinfectant power to a very high degree, Mother Ganges contains the various chemicals (found in those herbs) in a nascent condition. As such other pollutants lose their powers to defile the Ganges when thrown into her waters. All our religious dogmas are based on sound scientific reason.
Yes, all sins are washed away by a dip in the Ganges when there is a real Bhav in your mind that you are atoning for your wrong doings.
Our holy culture is essentially spiritual in every respect. Only when the Spirit is forgotten, dualities like decency and indecency arise. All these dualities exist for the worldly man and not for him who tries to go beyond them and establish himself in that non-dual, differenceless state. From the spiritual viewpoint, how can you then come down to the level of finding the existence of dualities and getting affected by them?
The spiritual significance of remaining naked lies in its being a helpful factor in getting over the body-consciousness or Sarira Abhimana. The man whose mind is tainted with worldly thoughts and who is awake to the dualities will feel ashamed to present himself in his birthday robe in public. Only he who has conquered his senses and mind can roam in a state of nudity in public fearlessly and without the least emotional disturbance.
Some adopt this as a part of their Sadhana to overcome the body consciousness and such people generally avoid the crowds.
Of course, there are people who impersonate realized sages and move about duping the innocent public. But people can easily understand these pseudo-saints by their reactions and hence shun them.
On medical, psychological, moral and spiritual grounds. The mind is made up of the essence of the food that a man takes. Tamasic food results in a Tamasic mind. Meat is Tamasic and hence should be avoided.
When an animal is killed or butchered, a contraction of its nervous system takes place on account of fear. (And you might have felt certain disturbances in your own stomach when you have experienced fear.) This leads to the secretion of certain poisons in the liver, etc., of the animal. These poisons are cumulative in their nature and are never removed or lost during the process of boiling or cooking meat. Hence, meat-eating is poisonous and dangerous in the long run.
There is no difference between you and an animal when both are considered as souls inhabiting the bodies. From whichever source you derive the right to live and enjoy in this material body, from that very same source, the souls of these animals have derived equal rights to live and enjoy in their material bodies. Hence, you do not possess the moral right to kill a single living being, however small it may be.
Last. but not the least, there is One Consciousness which has expressed itself in the form of the various beings, animate and inanimate. And this makes you one with all beings. When you have known this, will you consciously hurt any being? Can you willingly and joyously cut your own fingers and cook them and eat them? Knowing this oneness alone is the purpose of your coming again and again into the mundane plane. You can know, feel and experience this oneness only when you stop injuring and hurting others and begin to love all as your own Self. Verily, the animals are thy own Self. Thou alone art residing in these animals as the individual souls and thou alone art manifest in the form of the material bodies in which these souls reside. Hence, wake up; stop meat-eating and butchering the animals. Develop love for them and promote oneness.
 
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