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The soul itself happens to be skeptical of the soul; it is immensely amazing that it is the doubter of itself! (58)
Explanation & Discussion:
After presenting his doubts the pupil had said that there is no reason to believe in existence of soul. The Guru has successfully countered his arguments. While taking into consideration all the points underlying the pupil's arguments, he has convincingly shown the existence of soul in simple language which anyone can understand. The ability to explain the abstract nature of soul in such simple terms was the unique characteristic of Shrimad.
Finally by way of climax the Guru tells the pupil, "You doubt the existence of the soul, but have you considered who actually doubts? Who thinks that I have doubt? Who is that 'I'? Do you know who has the capacity to doubt?" Doubting is the property of soul. Lifeless matter does not have that capability. Doubt presupposes the existence of the doubter. Thus doubting itself is the evidence of soul's existence. To doubt the existence of soul amounts to saying, "I do not exist". But unless one exists, how can he doubt? The Guru therefore states to the pupil, "By doubting the existence of soul, you are doubting your own existence. Can there be anything more amazing or more ironic than that?"