Acharya Prashant explains that self-knowledge is the direct means to liberation, as stated by Adi Shankaracharya. He defines self-knowledge as the continuous observation of one's actions and the underlying processes of life. Most people live in a constant flow of events and reactions without ever pausing to understand the source of their actions. Self-knowledge involves becoming aware of this movement and stepping outside of it to witness what is truly happening. It is the simple act of keeping an eye on the constant flow of nature and identifying the 'doer' behind every action.