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 the mystery of God's greatness, but God Himself 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 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 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.