Only a joyous people can sustain pointless activity, festivity, and rest. Only a people who can sustain pointless activity, festivity, and rest can be joyous. And only a joyous people can finally resist the culture of death, because only through the embrace of pointless activity and the repose in finite forms can we resist this culture’s evacuation of substance.
In simple words, without Christ, we are without God and without hope in this world. One vivid illustration and outworking of this, is the grotesque Islamic terrorism we are currently witnessing in the Middle East. Now, because I know that's not entirely convincing on it's own, here is a very well-read & extremely clever chap saying the same things. Read him here