We are free, but we must choose. Freedom is not some vague, windblown thing which floats about anywhere and everywhere. No, freedom must make choices. It exists to make choices, because life is only life by the interrelation of its opposites. Those who have tried to escape to what they conceive as ultimate freedom by some mind-blowing drug only arrive at nothingness.
Life consists of making choices.
We have to choose. But because we freely choose, we enjoy our slavery. So now we see that to be a person means we have desire and knowledge and will.