Jehovah ‘fully knew’ his Son from his intimate association with him during countless ages past (Matt. 11:27; compare Genesis 22:12; Nehemiah 9:7, 8), and could therefore assign him to fulfill the unerring prophecies of his Word. (Isa. 46:10, 11)
... This he did, not just by using that Name, but by revealing the Person it represents, displaying his Father’s splendid qualities, his love, wisdom, justice and power, enabling persons to know or experience what the Name stands for. (Matt. 11:27; John 1:14, 18; 17:6-12)