I used to define contentment as being thankful for what you have. I still think thankfulness is a big part of contentment, but I also think it is more. I now think that contentment is best defined by simply wanting what you have!
When tempted to be discontented, I used to feel guiltly, because I was being ungrateful for all that I had. While that is still true, guilt doesn't solve my heart problem. The positive way to stop discontinted feelings is to concentrate on wanting what I have.
When I want what I have, there is no time to want what someone else has. And, wanting what I have is the ultimate in thankfulness.
(The picture I chose for this post is our wonderful van and pop up. Both things I struggled to be content with in the past. )