For Sartre there is no fixed human nature or divine blueprint telling us who to be: “existence precedes essence”. We find ourselves in the world and must define ourselves through our choices. That is liberating, but also heavy. We are “condemned” because we did not choose to be free, yet once here we are responsible for everything we do - even refusing to choose is a choice. Blaming upbringing, circumstance or “human nature” is what Sartre called bad faith. The phrase captures both the anguish and the dignity of being human: no excuses, and no limit to who you might become.