The text says even a 'wise' person can have knowledge that is actually ignorance. How is that possible?

Chapter 50 explains this apparent paradox by defining what constitutes true knowledge versus its imitation. A person may be considered 'wise' by worldly standards, but if their mind is fixated on wealth, luxury, and ceaseless sense enjoyment, their knowledge is dismissed as mere ignorance. The text states that someone constantly thinking of their wife and sons, deluded by these attachments, does not know their own welfare. Their knowledge is not liberating because it is devoid of devotion and covered by ignorance. Furthermore, the chapter notes that when doubt enters knowledge, even a wise person can become prideful, and this corruption of knowledge is likened to ignorance. Thus, without devotion and freedom from doubt, a person's perceived wisdom is ultimately a form of bondage.