Why do scriptures and intellectual efforts fail to grasp the essence of the Soul, as explained in the text?

Chapter 50 explains that the true essence, or "Substance," of the Soul is beyond the reach of conventional knowledge. The text states that even the Vedas made a great effort but could not find its place, and the six major philosophies (Shad-darshan) only remained arguing without grasping it. The Self-substance is never subject to the intellect, no matter how discriminating. The text uses the powerful analogy that great 'word-pandits' are like fireflies before the sun of the Substance, highlighting that verbal knowledge pales in comparison to direct realization. Once the Substance is obtained, the entire web of words simply vanishes.