"But if a strong will can stop a fakir's heartbeat at will, make him bleed or not bleed at will, certainly it can keep anybody from yielding to weakness or crime."
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How do Yogis develop that power? I am sorry this cannot be explained in a book. It can only be taught to those who are seeking truth, not to the faithless. But I will explain as much as can be given in any book.
First I will give the idea of Samyama from Katha : "The Wise should sink the Speech into Mind. Mind should sink into Intellect. Intellect should sink into Self. The Self should sink into the Great Self. The Great Self should sink into Eternal Peace (Self-God).
First. Lips should close, ears should open.
Second. Mind should stop wandering about.
Third. Thoughts should he suppressed, the Intuition should be developed.
Fourth. Intuition should be suppressed
and Ego should be felt.
Fifth. Ego should be merged, blended into the Great Self.
The Great Self into Self Peace." (God--Universal Soul).
The above reference is to the practice of Yoga known as Samyama.
What the Yogi gains by Samyama. "The direct perception gives the Yogi the right meaning, the inspiration gives him the word, the intuition gives him the right conclusion and discrimination saves him from error." The Yogi sees the truth face to face.
Any one can develop the above power by daily practice of Yoga. "But man can become aware of things which the senses can't grasp, Budhigrahyam atiudriyam (the reason or intellect) The proof of this you can get daily, when the Yogi's power is developed. This fact that man can see with his Budhi (intellect), the truth about a thing he has never seen or known before, is enough to destroy the materialistic idea of thought.
"What is knowledge? In what does it consist? We must distinguish between knowledge in itself and the means of knowledge. Again, among the means we must distinguish between the instruments and the
operations performed with the instruments.