Bastards can never pray, because they don't have a Holy Father.
The Bastard's Prayer
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is playing on the words "Holy Father." Bastards, bless their hearts, are born outta wedlock, meaning their daddies ain't exactly sainted. And since they ain't got a legit "Holy Father," they can't get down on their knees and pray. Get it now, Einstein?