As a believer (some one who has accepted Jesus Christ as the one who is in charge of them) we are called to something more epic than we realize. Life in general is pretty depressing when we we have no purpose and no vision for our lives. If we make our lives according to our our plans and ideas, generally we end up empty and wanting more.
This is the great struggle in the human life. Often the cause of the human condition is this ambition to be something greater, but we have no idea how to be all our hearts know we should.
The answer is in our relationship with Jesus. Jesus came to give us the life and the light for us to be brought into the beginning of our true selves, the ones who carry the fullness of the light and the life of God himself. (See chapter one of the book of John it’s all there)
