A full life or an empty life?

Yesterday Vuji came up with a question, "What if after taking so much time to minister to other people and to live a life of integrity and believing in the saviour, we still find that our life is empty?" I guess that's the feeling of many people. They have believed in the saving power of God, have become committed members of the church and have lived such virtuous lives. But deep down in their hearts, there is still something missing. What went wrong?
I tried to give some practical suggestions to Vuji, ranging from getting busy with activities, setting up short-term and long-term goals, even getting married. However, those are , somehow, only a diversion. The emptiness is still there.
I promised him that I will try to find out what went wrong and what can be fixed and I will start with interviewing some people at different stages of life.
He also asked one important question. What does it mean when Jesus said, "I have come that they may have life, and have it to the full"? I was silenced as I also do not really know what it means. Therefore, at my spare time, if any could be found, this week, I will try to answer these questions.
So are you living a full life or an empty life?