1 John 5:7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
The fact that they are One is in the Spirit. They are of one mind and accord. The manifestations of that One Spirit are Father, Word, and Holy Ghost. The name of Jesus, in heaven was the Word of God. The Father is like the great Architect. The Word is creator God. The Holy Ghost functions as Teacher and Guide. Each has a purpose. All are God. Each is co-equal with the other. People have questioned this scripture saying how can they they be one but be separate. We should look more from the spiritual standpoint to understand what it is saying. Jesus said He and the Father were One, but at His baptism all three were present. Jesus was being baptized, the Father was the voice that came from heaven and said this is my beloved Son. The Holy Ghost was symbolized by the dove that lit on Jesus. I believe they are one in the Spirit, as we are one with Jesus in the Spirit when we believe. We look at an egg and we say, behold an egg. Really that egg consists of shell, white and yellow, but they all three are an egg. It is difficult to separate the Father, Word and Holy Ghost, other than their purpose. Believe completely in your heart, and you will not go too far wrong.