The text mentions that even a wise person can be led astray. What is the cause of this, and what is the solution?

Chapter 50 explains that even a supremely knowledgeable person can suffer loss due to 'vikalpa,' or doubt. Ignorance manifests from this doubt, and when it enters one's knowledge, it can cause even a wise person to become prideful and go astray. The text uses a powerful analogy, stating that a single drop of fermented gruel can ruin a large pot of milk. The prescribed solution is to first understand this ignorance and seek its removal with the help of a Guru, as it cannot be removed without one. By doing so, the mind is purified, allowing infinite 'knowledge' to manifest and leading to non-dual Samadhi.