Existentialists believe that our human 'essence' or 'nature' (way of being in the world) is simply our 'existence' (being in the world). More simply put, the 'essence' of a human, or what makes a human a 'human', is not due to nature or uncontrollable circumstances; rather, human essence is really just what we choose to make it. This means that the only nature we as humans have is the nature we make for ourselves. As a result of this, existentialists think that the actions or choices that a person makes are very important. They believe that every person has to decide for themselves what is right and wrong, and what is good and bad.