Halfway through Peter Rollins' book, "How (Not) to Speak of God," I found these wise words:
A faith that can only exist in the light of victory and certainty is one which really affirms the self while pretending to affirm Christ, for it only follows Jesus in the belief that Jesus has conquered death. Yet a faith that can look at the horror of the cross and still say 'yes' is one that says 'no' to the self in saying 'yes' to Christ. If one loses one's life only because one believes that this is the way to find it, then one gives up nothing; to truly lose one's life, one must lay down that life without regard to whether or not one finds it. Only a genuine faith can embrace doubt, for such a faith does not act because of a self-interested reason (such as fear of hell or desire for heaven) but acts simply because it must. A real follower of Jesus would commit to him before the crucifixion, between the crucifixion and the resurrection, and after the resurrection.
And then here's the kicker:
Love acts not whenever a certain set of criteria has been met, but rather because it is in the nature of love to act.