When we depart from iniquity, we need God to remove the past sin from our lives. When we are baptized in the name of Jesus, He washes our sins away in his blood. We step forth from the water with a fresh start for God. We cannot enter the kingdom of heaven without a cleansing process. When we call on the name of the Lord, God answers with heaven's blowtorch.
Jewelers use a blowtorch to refine gold or silver.
As the blowtorch melts the gold or silver, slowly all the black impurities in the molten lump come to the surface where they can be removed. For then will I turn to the people a pure language, that they may all call upon the name of the LORD, to serve him with one consent. Every human language has profanity. Every one has been used to tell a lie. Every one has words to describe the evil deeds of sinful humanity.