The detail from the sermon from Winthrop that warns them that selfishness and greed will break their agreement with God and their mission will fail, which helps convey the purpose is “…and, dissembling with our God, shall fall to embrace this present world and prosecute our carnal intentions, seeking great things for ourselves and our posterity, the Lord will surely break out in wrath against us...”*
According to the sermon, WInthrop warns them that their greed and selfish desires will cause God to turn his back on them and fight them. He proceeds to back his claims up by telling them that God will prosecute their "carnal intentions" and "break our in wrath" against them.
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