At the sources of logic and the existence of God
In the Trinity there is the origin from the Father but he himself cannot exist without the love of the Son in the Spirit which allows them to be totally intimate with each other in him and with him, precisely the Spirit.
In the Trinity, therefore, each person is constituted and constituent in his own way. Only love is life.
In some free way on God’s part, we too, in addition to being constituted, are in the Son, in the Spirit, constitutive of the Trinitarian communion. And everything in its own way. The principle of causality is more nuanced than can sometimes be understood.
Only in the Trinity is the logic of causality explained. Outside of it this logic can be understood more reductively and moreover it ceases to go back to the first causes. Who created the world? If God did not create it, causal logic ends right in its source. If God created him who created him? A mono God does not solve the question, nor does anyone but a triune God solve it.