'Contentment' in the Bible

I have experienced times of need and times of abundance. In any and every circumstance I have learned the secret of contentment, whether I go satisfied or hungry, have plenty or nothing.

But godliness with contentment is great gain.

You are jealous and covet [what others have] and your lust goes unfulfilled; so you murder. You are envious and cannot obtain [the object of your envy]; so you fight and battle. You do not have because you do not ask [it of God].