What does it mean to be a human being?

Act that the principals guiding your life
might become a law for the entire mankind

Now I will emerge from my
self imposed immaturity

This duty by myself shall strengthen my mind:
to keep in my self the dignity of mankind

Now I will have the courage to use
my own reason, to fight for my freedom

What can I know? What shall I do?
What may I - may I hope? What does it mean?

What's the meaning of our being
can we know what it means to
to be a human being?!