“Greater love hath no man than this, that a man lay down his life for his friend” is a Gospel quotation (John 15:13). In the Biblical context, Jesus Christ is speaking to his disciples, calling them his friends and implicitly predicting his own death by crucifixion to save them—and all humanity—from sin. When Reverend Ballou quotes this passage, it implies that he knows Joseph cooperated with Mr. Brook’s kidnapping to protect Jack, sacrificing himself to save his foster brother (though Joseph, of course, certainly didn’t know he’d die). Implicitly, then, Jack starts crying because he realized his and Joseph’s friendship transcended ordinary friendship: they had the “greater love” for each other that includes mutual support, altruism, and self-sacrifice.