Lesson 4, continued:Preach or teach the Word (Acts 20:7; 5:42)The teacherObligated to please God, not man (Galatians 1:6-10; II Timothy 4:2-4)Must preach truth in love (Ephesians 4:15), so as to be understood (I Corinthians 14:19), and with authority (Titus 2:15)The listenerMust listen discerningly (Acts 17:11; Luke 8:18)Listen not to prove self right, or the other wrong, but to learn truth.Must obey and uphold truth (James 1:22-25)Must reject and expose untruth (I Thessalonians 5:22; Acts 18:24-26)Sing (Colossians 3:16; Ephesians 5:19)Singing must be from the heart, instructive to others (Colossians 3:16), and in praise to God (Hebrews 2:12)Vocal, not mechanical music is authorizedAll passages in the New Testament that mention music in praise of God specify vocal; thus, there is no authority for mechanical instruments of music in praise of God.Wrong to add to or take from things written (Revelation 22:18-19)Wrong to add mechanical instrument in praise of God.Wrong to take away the vocal, i.e., refuse to sing in the assembly.