John Chrysostom
What prevented the Jews from declaring that John's baptism was 'of men'? It is mentioned that they were afraid of the crowd. Can you perceive the corruption within their hearts? They disregard God at every turn, yet act solely for the approval of others. They respected John not for his intrinsic worth, but because of the people's opinion; for the sake of the crowd, they chose not to put their faith in Jesus Christ—and therein lies the root of all their misfortunes.
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See Matthew 21:23.