One-way love is incrutable or irrational not only because it is out of relation with the intrinsic circumstances on the part of the receiver. One-way love is also irrational because it reaches out to the specifically underserving person. This is the beating heart of it.
– Paul Zahl
as quoted by Tchividian, Tullian; One Way Love: Inexhaustible Grace for an Exhausted World; David Cook Publishers; copyright 2013; Kindle Edition; Location 1165