selfish
Explanation
This comic presents a philosophical dialogue, likely between a priest/theologian and a parishioner, exploring the concept of selfhood through the lens of cellular biology and the theological question of God's nature.
The theologian poses a series of thought experiments: If every brain cell is replaced but "you're still you," and if a process gradually replaces old cells with new ones using old cells as a blueprint, "are you still you?" The answer each time is "also easy -- yes." Then the theologian asks about random cell loss causing personality changes -- "Is that still you?" The response: "It's transmissible, transferable, it's not destroyable, it can be formed, it can be slowed down."
The theologian then asks: "Did you ever have a son who is also you, or became you?" The parishioner replies: "Really? The hard part is the genealogy?"
The comic uses the classic Ship of Theseus philosophical problem (if you replace every part of something, is it still the same thing?) as an analogy for Christian theology, specifically the concept of the Trinity and the divine nature of Jesus as both God's son and God himself. The joke is that the parishioner can easily accept all the mind-bending philosophical puzzles about personal identity and cellular replacement, but finds the theological claim of God having a son who is also God to be the genuinely difficult concept -- or alternatively, finds the genealogical record-keeping to be the hard part, which humorously deflates the theological profundity.