It’s my belief that God is one God revealed in three persons. The Father loves the Son and the Son loves the Father. The Spirit of love that flows between them overflows and out of this overflow of grace the universe was created. God didn’t create out of need as if He lacks something. No, it was by the overflow of His grace that He created. I say grace because you cannot deserve to be created. Now, the Father loves the Son and delights in the Son. Scripture tells us that the Father said “this is my Son in whom I am well pleased”. The scriptures also tell us that Christ is in the exact image and likeness of God. So, when the Father beholds His own beautiful image in the Son He is infinitely happy. God delights in His own beautiful image of holiness. We can put it this way:
The Father is God
The Son is God
The Father delights in the Son
Therefore, God delights in God
God delights in Himself
This overflow of joy is the Holy Spirit who also delights in the Father and Son.
We can go even further here.
The Father is God
The Son is God
The Son worships the Father
God worships God
Therefore God worships Himself (loves Himself more than anything)