How does one attain true knowledge, and what is the role of devotion in dispelling the ignorance that soils the mind?

According to the teachings in Chapter 50, true knowledge (Brahman-knowledge) is paramount, rendering rituals like bhajan and worship meaningless without it. The mind is described as being soiled by ignorance (Avidya), and the only way to cleanse it is through devotion to God. The text explains that devotion is the prerequisite for knowledge to be born. It uses an analogy: just as applying a special collyrium (Anjan) to the eyes of one born feet-first allows them to see underground wealth, resorting to devotion removes the veil of ignorance, allowing divine knowledge to dawn. Therefore, devotion is presented as the essential proof and catalyst for destroying the bondage of ignorance and achieving true wisdom.