In conclusion, I urge you, brothers, to hold fast the doctrine of the Trinity, because all those who forsake it fall into serious doctrinal errors which are the consequence of the denial of the Trinitarian concept of God. Know this, departure from the doctrine of the Trinity has been and is one of the major sources of heresy in the Church.

Therefore, I exhort you to beware of those who, even though they claim to be Christians, deny in one way or another the Trinity, such as the ‘Jesus Only’ (Pentecostals Oneness), Jehovah’s Witnesses, Mormons, the members of the Church of the Kingdom of God (the followers of A. Freytag), and the followers of Moon. Put inside your hearts all the verses of the Scripture which support the concept of the Trinity, and all those which attest to the divinity of Jesus Christ and of the Holy Spirit, so that you may have all of them ready on your lips when you are asked questions about the Trinity and you have to refute those who oppose the truth.