About a week after I noticed this similarity, I ran across the parallel in Matthew 20:20-34. In this account, it's James and John's mother who asks on behalf of her sons, and Jesus' questions aren't identical ("What do you want?" in verse 21, but "What do you want me to do for you?" in verse 32). Because there are two blind men here, however, the account draws a sharper contrast between the two parties. The two brothers who aspire to high positions are more evenly balanced against the two blind men who demonstrate humbleness.
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*It's identical in English, but it differs slightly in other languages, principally depending on whether you is singular or plural.