Acharya Prashant explains that having access to spiritual knowledge without proper guidance is like entering a pharmacy full of medicines without a prescription. He observes that people often choose what they like or what is convenient rather than what they actually need. This selective approach leads individuals to pick 'medicines' that suit their existing ego or biases, such as choosing a book that reinforces their current state rather than one that challenges it. He warns that reading the wrong spiritual text or interpreting it through one's own cleverness can be as harmful as consuming poison, as the ego will only choose what sustains its own illness.