Just yesterday, I read that discontent can come from looking either within at self; or looking without and comparing your life against how you perceive other people's lives are. As for myself, I could not snap out of depression permanently until I looked up at God and read what He has to say about life in His book. This doesn't mean I don't have my "blue moments" or more challenging days, but when I compare my life now to how I felt decades ago...I'd never want to go back to how I was (but I would like to go back to how life used to be...like how it was in America in the 50's).
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"Has not my hand made all these things, and so they came into being?" declares the LORD. "This is the one I esteem: he who is humble and contrite in spirit, and trembles at my word." – Isaiah 66:2