Acharya Prashant explains that the fundamental difference between the characters in Ayn Rand's 'The Fountainhead' is not their work, but their underlying understanding of life. He describes Howard Roark as an absolute non-dualist who refuses to be dictated by society or his own bodily concerns. Roark represents the purest form of ego, which Acharya Prashant equates to the truth or the Self. Unlike others, Roark is not corrupted by external influences and remains undeterred by physical hardship or social pressure, as he abides in his own essential nature.