Reference

Distinction and Relationship in the Godhead

Christ taught a distinction of Persons in the Godhead which He expressed in specific terms of relationship, as Father, Son, and Holy Ghost, but that this distinction and relationship, as to its mode is inscrutable and incomprehensible, because unexplained.

Luke 1:35 [KJV/NIV]
1 Corinthians 1:24 [KJV/NIV]
Matthew 11:25-27 [KJV/NIV]
Matthew 28:19 [KJV/NIV]
2 Corinthians 13:14 [KJV/NIV]
1 John 1:3-4 [KJV/NIV])