Paul frequently quoted Old Testament passages in a way that reveals his understanding of Old Testament passages and how they relate to his mission of carrying the gospel to the gentiles. Paul’s reference to Isaiah 28 in 1 Corinthians 14 helps us understand exactly how the apostles understood Isaiah 28.
Does your ministry enslave people by making them dependent on you or does it empower them by freely giving them all you have? A cult is a ministry where the teaching enslaves you to the leader. Biblical ministry does exactly the opposite. The way you use your spiritual gifts is the crucial test of your ministry.