Excerpted from the Autobiography of a Yogi by Paramhansa Yogananda:-
The devotee who has achieved final salvation in the Lord finds that his body has completely fulfilled its purpose; he can then use it in any way he deems fit. His work in the world is to alleviate the sorrows of mankind, whether through spiritual means or by intellectual counsel or through will power or by the physical transfer of disease. Escaping to the superconsciousness whenever he so desires, a master can remain oblivious of physical suffering; sometimes he chooses to bear bodily pain stoically, as an example to disciples. By putting on the ailments of others, a yogi can satisfy, for them, the karmic law of cause and effect. This law is mechanically or mathematically operative; its workings can be scientifically manipulated by men of divine wisdom.
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