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The Short Answer
For the same reason a trial calls four witnesses instead of one. Matthew writes for Jewish readers (Jesus the promised King), Mark for Romans (Jesus the man of action), Luke for the wider Greek world (Jesus the Savior of everyone — Luke interviewed eyewitnesses, he says so), and John for the whole world (Jesus, God in the flesh). They differ the way honest witnesses always differ — angle, emphasis, detail — and that's evidence of independence, not error. Four identical accounts would smell like collusion.
How sure are we? The differences are real, well-mapped for 1,900 years — and they never break the story
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Key Scripture
tap any to readLuke 1:1-3 — Luke shows his method
Read →“Since many have undertaken to set in order a narrative... even as those who from the beginning were eyewitnesses... it seemed good to me also, having traced the course of all things accurately from the first, to write to you in order.”
John 20:31 — John shows his purpose
Read →“But these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in his name.”
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Watch
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The Famous "Contradictions"
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From the Collection
Canon of Scripture Established
see it on the timeline
The Bible — read all four
Matthew, Mark, Luke, John
Who chose the books of the Bible?
the companion question
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Why It Matters
“You don't get four portraits of a legend — you get one official one. Four angles on one man is what history looks like when it really happened.”
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