According to the author, why were the gospels written so many decades after the life of Jesus?

Question

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The author states that the gospels were written many decades after the life of Jesus because "Jesus had not returned as they had expected, and the apostles had died." This suggests that the early Christians initially believed that Jesus would return soon, but as time passed and the apostles died, they realized the need to record and preserve the teachings and stories of Jesus in written form.

According to the Author, Why Were the Gospels Written So