Acharya Prashant explains that the subconscious mind can be exposed by closely observing one's daily actions and the superficiality of social interactions. He uses the example of a fake smile or a sudden shift in behavior during a phone call to illustrate how the subconscious, filled with hidden anger or violence, often contradicts the polite mask worn in public. He suggests that being openly bad is better than being secretly bad, as it allows for self-awareness of one's internal state. While truth may initially be bitter, it must come before sweetness can be achieved.