39. What is Nadi Suddhi in its technical sense? How to feel that one has attained perfect Nadi Suddhi?

Nadi Suddhi means purification of the nerves (Nadis). Nerve is not the correct English term for Nadi. There is no appropriate word for Nadi in English.

Complete fast, preferably without any liquid or solid food, practice of Asans and Pranayam, and intense physical exercise— all go a long way in the elimination of fat and other unwanted matters and in the overhauling of the system to confer the benefit of Nadi Suddhi. Asans and Pranayam can purify the nerves, if done with the correct technique.

When one attains Nadi Suddhi, the body becomes light. Stool becomes scanty. There is agility in movement and activity in demeanour. No trace of slothfulness or indolence can be detected. While walking, the body appears to be floating in the air. The tone of the voice changes from hoarseness or gruffness to mellifluence. Hopping, jumping and dancing while at work can be observed in one endowed with Nadi Suddhi. Something inexpressible forces the person to do this and to achieve something grand in his lifetime.

40. What are the best and the worst methods to retaliate against a wrong done to us for no fault of ours?

Whether a wrong is done on some basis or not, it is not to be retaliated against in any way if one wants real moral and spiritual strength and the Lord's grace. Calmly bear the wrong done to you without the slightest mental upset or loss of psychic equilibrium. Do good to the man that does harm. Bless that man that curses you. Pray for the well-being of the man that beleaguers you. Study the lives of Jaya Deva, Shams Tabriez, Jesus Christ, Gauranga and other saints. The Lord Himself protects His devotees if they surrender themselves totally unto Him, pouring forth prayers unto Him like Draupadi or Gajendra. Do not degrade yourself by resorting to retaliation in any way. Adherence to violence even in thought just to satisfy the lower mind debases the individual spiritually.

The best method to retaliate against a wrong done without any reasonable ground is by way of offering a spiritual treatise like the Gita or the Ramayana to the opponent and praying for his gaining the knowledge of the Self and avoiding the evil ways which are due to his ignorance of the essential unity of all creation. Observe silence and indifference with heart-moving prayers unto the Lord.

41. Does the mental equilibrium of an advanced Yogi get affected when attacked by some serious disease? How does he react on such occasions?

Never. If there is any thought of the body or the disease or the bodily affliction or something that cannot be tolerated by the fleshy frame, remember that he is no advanced Yogi or saint or Sannyasin. He who has no thought of himself or the surroundings or the world, he who is centered in his own Self or his beloved Ishta Devata or gracious Guru, and he who is entirely oblivious of limitations of any sort, and identifies himself with the limitless, diseaseless, unconditioned, all-pervasive Brahman, is a true and advanced Yogi or Bhakta or Jnani; and not otherwise.

He can have no match in the whole world in the matter of utter indifference either towards his disease or towards his limited, perishable body or the whole world. He always remains in his own Self and he never loses his balance under any circumstance. He firmly believes that he is the Infinite, the Absolute Brahman. He firmly believes that death awaits all and snatches away everyone at one time or the other and that the six Urmis¾ Shoka, Moha, Kshut, Pipasa, Jara and Mrityu— are but common to all the Jivas, not necessarily mankind, and that he is the deathless, imperishable and eternal Brahman. Hence there can be no mental upset for him even amidst crucial tests.