The Spirit of the Lord is the Spirit of truth, holiness, and unity. He is also the Spirit of evangelism! The prophet Isaiah spoke prophetically of the Spirit of the Lord who would come upon the Lord Jesus to equip Him as prophet to proclaim the good news concerning the Kingdom of God, Luke 4:18-19. Jesus commanded His Apostles to remain in Jerusalem until the Spirit of Promise came and when He comes "You shall receive power and you shall be witnesses unto Me in Jerusalem, Judea, Samaria, and unto the utter most parts of the earth," Acts 1:8! And that same Spirit is the Spirit who is promised and given to all who repent, Acts 2:38. Where the Spirit of the Lord is there is the Spirit of evangelism!

The three marks of a true church are: 1. The faithful preaching of the Word of God, 2. The faithful administration of the sacraments, and 3. The faithful administration of Biblical church discipline. Of late, however, a number of theologians and preachers have felt the necessity to add number 4., The faithful practice of Biblical evangelism. Greg Bahnsen adds a fourth and fifth: 4. Inwardly, fellowship in worship toward God and mutual concern for His people, Acts 2:42, 44-47, Hebrews 13:15-16, I Cor. 12:7-27; and 5. Outwardly, service toward the world in evangelistic outreach, Acts 2:40, 41, 47, Mat. 28:18-20, and seeking transforming holiness in every area of life, Rom. 12:1-2, I Peter 1:14-16, Col. 1:9-23, Mt. 5:14-16.