“The Nature of Identity”
I choose to interpret this as the nature of purpose as related to identity. To me there may not be a general “purpose” for us existing. The purpose is what you make of it. Find something you love and figure out a way to do it for the rest of your life. That becomes your identity and purpose. Have fun and enjoy the time you have. Remember, your life and time will always be what you make of it, even in the most dire of circumstances.