For there are three that bear record in Heaven: the Father, the Word, and the Holy Ghost, and these three are one. 1 John 4:7
Bible manuscript experts disagree whether the last part of our text should even be in verse. Those who say it should not be point to the fact that the words ‘the Father, the Word, and the Holy Ghost, and these three are one’ do not appear in any manuscripts earlier than the 5th century. I am not an expert on Bible manuscripts, but I can give you three good reasons why that part of the verse should be there. Firstly, the translators of the King James Version WERE experts and they deemed those words to belong there. Secondly, the verse would be confusing without those words, because it would speak of three that bear record in Heaven, without identifying those three – and God is not the author of confusion (1 Corinthians 14:33). Thirdly, all of the rest of the Scriptures confirm the truth of those words: the harmony, the unity, and the testimony of the Trinity.
God’s great plan of salvation displays the harmony of the Trinity. We read of the Father sending the Son to be the Saviour of the World (1 John 4:14). To accomplish this, we read of the agency of the Holy Spirit at the time of Mary’s conception (Matthew 1:18, Luke 1:35). The Old Testament is a record of God’s plan to provide Himself a Lamb (Genesis 22:8), and a catalogue of illustrations, examples, and shadows of the One Who would come to fulfill the Father’s will. The Gospels in the New Testament relate the work of the Lord Jesus as He moved among men, filled with the Holy Spirit. During His sojourn, Jesus spoke often of the Holy Spirit Who would come after He returned to Heaven. And the book of Acts tells of the arrival of the Holy Spirit to empower the apostles and all of those who were saved to preach, to testify, to live, and to die for their Lord. Throughout the Book we find the distinct roles of the three Persons of the Trinity, in the harmony of the purposes of God.
The Trinity is a great mystery. Far greater men than you and me have been unable to explain it. But mystery or not, the three Persons of the Godhead are One in Their love for us, in Their provision of salvation for us, and in their assurance of our eternal home in the presence of God. – Jim MacIntosh