Practical Use of a correct Idea of the Lord

The first and chief thing of a church is to know and acknow­ledge its God; for without that knowledge and acknowledgment there is no conjunction; thus there is none in the church without the acknowledgment of the Lord. (HD n. 296)

The very essential of the church is the acknowledgment of the union of the very Divine in the Human of the Lord, and this must be in each and all things of worship. The reason why this is the essential of the church, and hence the essential of worship, is because the salvation of the human race depends solely on that union. (AC n. 10370)

In the whole heaven no other one is acknowledged as the God of heaven than the Lord alone. They say there, as He Himself taught, that He is one with the Father; that the Father is in Him, and He in the Father; and he that seeth Him seeth the Father; and that everything holy proeeedeth, from Him (John x. 30, 38; xiv. 10, 11; xvi. 13-15). I have often talked with angels on this subject, and they have constantly said that in heaven they cannot distinguish the Divine into three, since they know and perceive that the Divine is one, and that it is one in the Lord. They said also that those who came from the world, out of the church, with whom there is an idea of three Divine [persons], cannot be admitted into heaven, since their thought wanders from one to another; and one may not there think three and say one, because in heaven every one speaks from the thought, for speech there is cogitative, or thought speaking. Wherefore those who in the world have distinguished the Divine into three, and have acquired a different conception of each, and have not concentrated and made it one in the Lord, cannot be received; for there is communication of all thoughts in heaven. If therefore any one should come thither who thinks three and says one he would immediately be discovered and rejected. But it should be known that all who have not separated truth from good, or faith from love, when instructed in the other life, receive the heavenly idea of the Lord, that He is God of the universe. It is otherwise however with those who have separated faith from life, that is who have not lived according to the precepts of true faith. (HH n. 2)