To a deserving devotee, Jesus told He and His father are one and the same. When Jesus saw a devotee who was slightly affected by jealousy and egoism, Jesus came down by one step saying that He was the son of the God. The word son is indicating that He is different from the God but the same spirit is present in both like the same blood in the father and the son.
This means that He is different and smaller than the God but at the same time has the same essence. It is like the relationship between the mighty ocean and the tiny water drop. The father is major and the son is minor component. They resemble qualitatively but differ quantitatively. This is the visishta advaita of Ramanuja.
When Jesus met a devotee who is fully bacterialised by jealousy and egoism He told that He was the humble messenger of God. This is the Dvaita of Madhva. Therefore the human incarnation will declare its level based on the level of the receiver. Mohammad told that He is the messenger of the Lord. Thus there is a gradual degradation of spiritual obedience and the gradual growth of jealousy and egoism. Jesus stands as a transition bridge between the Advaita of Krishna and Dvaita of Mohammad.
At the Lotus feet of Datta Swami