When thinking about the mystery of the Holy Trinity and the brevity of the readings with which the Church invites us today to meditate on this mystery, it could be said that, instead of explaining it, it is rather a matter of contemplating it. To be in the disposition of which the Word of God speaks to us today.
We cannot enter into the mystery of God's greatness, but it is God Himself who makes Himself known to us through prayer. It is the Lord who comes down from heaven and stays with us, as he stayed with Moses; willing to walk with us, despite our sins and that we continually ignore it by not taking it into account in our activities.
Today we meditate on the words of Jesus to Nicodemus: "For God so loved the world that he gave his only Son, so that everyone who believes in him might not perish but might have eternal life." (Jn 3:16) God shows himself to us as love and, to understand such a love, means letting oneself be loved by it, accepting it, assimilating it, making it one's own, and that is to begin to understand the mystery of the Trinity.