He chose this format because it was the closest to the sermons the audience was used to.
"A Model of Christian Charity" is a speech that justifies the maintenance of social differences between people, stating that this is God's desire for society to function and for people with more power to help those most in need.
Winthrop wanted to convey a very clear and understandable message to the public and for that reason, he decided to write the speech as if it were a religious sermon. This was very effective, as the speech was accepted and supported by a Puritan community that overvalued religious precepts.
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