'God wants to be the God of those who are perpetually discontented. We aren't called to be cynical or negative or distrustful, but God does call us to be discontented.
The idea of perpetual discontent flies in the face of everything that our culture tells us about happiness. It challenges the notion that happiness is even something worth pursuing. In some ways Hebrews 11 praises the saints of history for their discipline in staying unhappy. They could have settled in a comfortable place, but they did not settle; they kept going.'
Michael Mangis, Signature Sins, p.145.
