For there are three that bear record in heaven, the Father, the Word, and the Holy Spirit: and these three are one. And there are three that bear witness in earth, the spirit and the water and the blood: and these three are together (1John 5:7-8).
“When we read Holy Scripture, we should be alert to keep an eye on every word. To the rapid reader, for example, this distinction which the Evangelist draws between the Heavenly Trinity and the earthly trinity will not become apparent. Concerning the Heavenly Trinity, he says, and these three are one; and concerning the earthly trinity, he says, and these three are together. There is an enormous difference between “being one” and “being together.” The Father, Son and the Holy Spirit are One, whereas the spirit , the water and the blood are only together and are not one. Even enemies could be together, but are not one. All the people on earth are together, but they are not one. Water and blood constitute the body, and the spirit is the spirit. For the flesh has desires against the spirit and the spirit against the flesh (Gal 5:17). They are not one, but they are still together. When man dies, the union is broken and ceases to exist. Blood and water go to one side, and the spirit goes to another side. However, the Persons of the Divine Trinity in the heavens are not only together, but They are One.
There is also another trinity in the inner heaven of man which should be not only a unity but a oneness, so that man may be blessed in this world and in the other world. That is the union of the mind, heart and will. As long as these three are only in togetherness, man will be at war with himself and with the Heavenly Trinity. However, when these three become one, so that none rules and none is enslaved, then man becomes filled with the peace of God, which passeth all understanding (Phil 4:7), that surpasses man’s every word, every explanation, every fear and every sorrow. Then the small heaven in man begins to resemble that great heaven of God, and the “image and likeness of God” becomes apparent in man.
O Triune God, help us to at least resemble those who resemble Thee. To Thee be glory and praise forever. Amen.”
– St. Nikolai Velimirovic