'Contentment' in the Bible

[Growing in grace] they will still thrive and bear fruit and prosper in old age;They will flourish and be vital and fresh [rich in trust and love and contentment];

But godliness actually is a source of great gain when accompanied by contentment [that contentment which comes from a sense of inner confidence based on the sufficiency of God].

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].