Here is the Christian life:

When a man applies himself with joy and love to the works of that freest servitude in which he serves others voluntarily and for nought, himself abundantly satisfied in the fullness and riches of his own faith.

Martin Luther

Which means, in my faith in Christ I could not be more satisfied. There is nothing in this world that brings more joy, more peace, more life that possessing and being possessed by Jesus Christ. Nothing compares to the greatness. No successs. No romance. No sense of being needed or accepted or worthwhile comes anywhere close to what we have in Him through faith alone, through his work alone. Therefore, we are free to give everything of ourselves, or our lives. All that we have in service to others because there is nothing that could add to our satisfaction-it is full in Christ.