The central irony in "A Letter to God" is that Lencho, who has absolute faith in God, ends up accusing the very people who acted as God's instruments to help him. The postmaster and employees sacrificed their own money out of genuine kindness to send Lencho seventy pesos. Yet Lencho, receiving less than the hundred pesos he asked for, concludes that the post office employees are "a bunch of crooks" who stole the rest — completely unaware that these very people were his benefactors. Those who helped him became the ones he suspected.
Source: A Letter to God, Chapter 1
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The examiner expects you to:
Keep it focused — don't just summarise the story. One crisp explanation of the unexpected twist earns full marks.