The kingdom of God also seems unnatural psychologically. When you hear Jesus say that he prizes weakness, poverty, suffering, and rejection, you say, “That’s masochism. It’s psychologically unhealthy. It’s impossible to live like that.”
And guess what, it is kind of impossible to live like that.
When you see Jesus caring for the poor, forgiving his enemies without bitterness, sacrificing his life for others, living a perfectly loving and perfectly sinless life, you say, “I can’t do that.” You’re right – you can’t. Jesus Christ as only an example will crush you; you will never be able to live up to it. But Jesus Christ as the Lamb will save you.
– Tim Keller, King’s Cross, p. 191, emphasis mine