Acharya Prashant explains that fear is not inherent to action but exists only before it as a product of thinking and conditioning. In the actual moment of action, such as speaking or asking a question, fear disappears because the mind is engaged in the present. He clarifies that fear is essentially a thought about 'the other' and how they perceive us. This dependency on others' opinions stems from the ego, which builds a self-image based on external approval. Because this image is borrowed, it is fragile, leading to constant anxiety about losing it.