The blessed Buddha once said:
Contentment
(santutthi)
is the Highest Treasure!
Dhammapada 204
Solitude is happiness for one who is
content,
Who
clearly sees and understands this Dhamma.
Udana 10

What is the proximate cause of contentment?
Mutual joy
with others success is the
proximate cause of
contentment...
Therefore: If one is always gladdened by other's success, one
will always be content!
Therefore: If one is never
gladdened by other's success, one will always be discontent!
Therefore is
contentment caused by an altruistic
mental state & not by external richness...
Example: Rich people possessing all the things they ever desired, can still
be very discontent!
And vice versa: Poor people not having much, can still be very content and
very much smiling!
Mutual Joy Audio Dhamma-Talk:
Rejoicing evaporates Envy and Jealousy..
https://soundcloud.com/bhikkhu-samahita/mutual-joy-causes-contentment

Great Contentment even with almost nothing!