When all our theological arguments and exegetical analyses have failed to convince the weary unbeliever, or the child of God wandering in the wastelands, the only final and all-conquering argment is a "life of love" {Eph. 5:1-2}.
Philosophers and sophists can spin their rationales, arguers can argue, atheists and agnostics can ride the wave of defiant unbelief... but there is no logical rationale for the one who, in the power of Jesus' Spirit, "blesses those who curse" them, "loves those who hate" them, and "prays for those who persecute" them. You can argue against logic, you can't argue against Life.