9What then did you go out to see? A prophet? Yes, I tell you, and more than a prophet.
10This is the one about whom it is written:
‘Behold, I will send My messenger ahead of You,
who will prepare Your way before You.’
11Truly I tell you, among those born of women there has risen no one greater than John the Baptist. Yet even the least in the kingdom of heaven is greater than he.
12From the days of John the Baptist until now, the kingdom of heaven has been subject to violence, and the violent lay claim to it.
13For all the Prophets and the Law prophesied until John.
14And if you are willing to accept it, he is the Elijah who was to come.
— Matthew 11:9-14

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Article by Stacy Voss

How could he know for sure? Stacy Voss reminds us that John the Baptist asked a deep and important question of Jesus and Jesus answered with not only truth, but also words of honor and affirmation.