I say to you this morning, that if you have never found something so dear and so precious to you that you aren't willing to die for it then you aren't fit to live.
Whenever a man chooses his purpose and his commitment in all clearness and in all sincerity, whatever that purpose may be, it is impossible for him to prefer another. It is true in the sense that we do not believe in progress. Progress implies amelioration; but man is always the same, facing a situation which is always changing, and choice remains always a choice in the situation. The moral problem has not changed since the time when it was a choice between slavery and anti-slavery."Existentialism Is a Humanism" (1946)
Emptiness is a symptom that you are not living creatively. You either have no goal that is important enough to you, or you are not using your talents and efforts in a striving toward an important goal.