First, we consider a philosophical proof of God's existence as the Creator who holds the world in existence always. We make "the argument from contingency" - that the existence of the universe which did not have to be implies that there is some Creator who exists necessarily.
However, although God's existence can be known by human reason, the mystery of the Trinity is known only by Divine Revelation and the gift of faith. By an analogy to the human soul, we understand the Son as the perfect image of the Father (God knows himself and the Father begets the Son), and the Holy Spirit as the love of the Father and the Son (God loves himself and the Father and the Son breath forth the Holy Spirit).
The Trinity dwells within us by grace, be heavenly glory we will dwell within the communion of the Three Persons forever.
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