In "The Daily Stoic," Ryan Holiday explores the philosophical inquiries surrounding the meaning of life, focusing on the teachings of Stoic philosophers like Marcus Aurelius. The text emphasizes that principles related to good and evil shape human existence, suggesting that true goodness is tied to justice, courage, self-control, and freedom. These virtues stand in opposition to what is deemed evil, which is anything that undermines these values.

Holiday draws from Aurelius' "Meditations" to underline the belief that a fulfilling life is rooted in upholding these core principles. The emphasis on personal integrity and moral character illuminates a path toward a meaningful life, highlighting the importance of striving for virtues that enhance not only individual wellbeing but also societal harmony.