The text mentions that the Soul is not a 'subject of speech.' How then is it possible to receive instruction or attain knowledge about it?

The text addresses this paradox by shifting the focus of instruction. As explained in Chapter 50, since the Soul cannot be described with words, the purpose of a speaker is not to explain the Soul but to guide the listener towards the removal of their own ignorance. The path to knowledge is not through external learning but through an internal process. By engaging in the worship of the Soul with the thought "I exist" and meditating on the non-difference between the individual soul and the Supreme Soul, the seeker pleases the Soul. In a profound act of grace, the Soul then reveals its own nature to the worshipper, bypassing the limitations of verbal instruction entirely.