I am not saying this because I am in need, for I have learned to be content whatever the circumstances.  I know what it is to be in need, and I know what it is to have plenty. I have learned the secret of being content in any and every situation, whether well fed or hungry, whether living in plenty or in want.  I can do all this through him who gives me strength.
(Philippians 4:11-13)

I haven't reached this point yet, but the more I believe and the stronger my faith gets, the more often I experience this joy and contentment regardless of my situation in life.