A common thread that runs through Holiday’s advice in Ego Is the Enemy is the importance of self-awareness. The author often counsels the reader to reflect on their own thoughts and actions, arguing that self-awareness is the foundation for overcoming their own egoic tendencies. He encourages the reader to adopt an active role in their own self-development and develop a critical lens through which to interpret their own thoughts, motivations, and actions.

Holiday employs the analogy of a fighter readying for a fight to illustrate how self-awareness is a critical aspect of preparation and success. Holiday writes,

Take fighting as an example […] where self-awareness is particularly crucial because opponents are constantly looking to match strength against weakness. If a fighter is not capable of learning and practicing every day, if he is not relentlessly looking for areas of improvement […] he will be broken down and destroyed (41).

Holiday thus presents self-awareness as a crucial part of both self-development and anticipating areas of weakness that could hinder one’s chances of success.

For Holiday, self-knowledge involves not only identifying missteps but also actively giving oneself reminders to beware of egoic motives, writing, “A smart man or woman must regularly remind themselves of the limits of their power and reach” (124).