(do not delete the following reply. I have typed it)
(This us a deeper understanding of the Christian Holy Trinity in regard to Itself.)
We call it agape.
God is unimaginable and beyond space. Nobody can see Him. Such God first created an energetic form in upper world known as Father of Heaven (other religions call Him as Allah, Yahweh, Narayana etc) and entered into It. Now the departed souls existing in the upperworld can see this Father of Heaven. But we human beings cannot see Him. The same Father of Heaven in whom the unimaginable God merged enters into a selected highly devoted human being known as Son of God to differentiate from other human ordinary human beings; to become Human incarnation of God or God in human form like Jesus(Rama, Krishna, Buddha, Muhammad, Shankara, Sai Baba etc) to preach divine knowledge to uplift the human beings here on this earth.
Now we human beings can see such God in human form. In fact this is the only way we can see Father of Heaven no other way than this way. When Father of Heaven comes to this world in human form, by meeting such alive human form of God we have met Father of Heaven only.
Since God is impartial He comes to this world in human form in every human generation to preach and uplift us. When God enters energy it is called Holy Spirit.
Thus we can say that
Unimaginable God = Father of Heaven= God in human form or Human incarnation of God(Son of God)= Holy Spirit.
Whoever see present human form of God has seen the Father of Heaven.