Never covet what belongs to someone else. Learn to appreciate what you have.
Read: Proverbs 15:15-17
15 For the despondent, every day brings trouble;
for the happy heart, life is a continual feast.
16 Better to have little, with fear for the Lord,
than to have great treasure and inner turmoil.
17 A bowl of vegetables with someone you love
is better than steak with someone you hate.