“The Lord is my light and my salvation. Whom shall I fear? The Lord is the strength of my life. Of whom then should I be afraid.” You find the relevant scripture to the given situation. It is the sword of the Spirit. That is to deflect a blow. But it is also used offensively. Your most powerful tool in evangelism is the word of God. God said, “My word will not return void. It will prosper in the place where I send it.” Your clever analogies may return void. But God’s word won’t. Use the word of God.