What is the primary motivation for evangelism? The glory of God. The reason every Christian ought to be committed to evangelism is because God is not worshiped as he ought to be. If you love God, then this means you must be committed to worshiping him. If you are committed to worshiping him, then you ought also to strive to see him worshiped by others.
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1 Samuel 3:1-21 (Part 1)