This quote means that the only way to fight against an oppressive and restrictive world is to be so free in your life and actions that even your mere presence is an act of resistance. This can mean anything from living your life in a way that goes against the societal norms or making choices that are frowned upon by those in power. It is a reminder that one person can still make a difference and that, by living a life of freedom and truth, you are already making an impact on the world and resisting the ideas placed upon you by others.