Acharya Prashant explains that becoming a teacher or a guru is not about obtaining a certification or reaching a specific status, but rather about a deep sense of responsibility and love. He emphasizes that if you see someone heading towards a downfall, the natural urge to help them is what defines the essence of being a guru. This role is born out of a sense of helplessness and compulsion to act when one sees potential in another being threatened by immediate circumstances. He uses the analogy of saving a small guava tree from a storm to illustrate that the intent to protect and help is more vital than having perfect expertise or a formal diploma.