The Most Holy Trinity
Solemnity - Sunday after Pentecost
Pope Francis's words on Trinity Sunday in: 2019 (in Camerino, Italy), 2018, 2017, 2016, 2015, 2014 & 2013 (in the Parish of Ss Elisabeth & Zaccariah, Rome).
Papa Benedict XVI's words on Trinity Sunday in: 2012 (in Milan at 7th World Meeting of Families), 2011 (in San Marino), 2010, 2009, 2008 (in Genoa), 2007 (at the canonization of George Preca, Simon of Lipnica, Charles of St Andrew Houben & Marie-Eugenie of Jesus Milleret), 2006 & 2005.
St John Paul II's words on Trinity Sunday: 2004 (with young people in Switzerland), 2003, 2002 (in Bulgaria), 2001 (at the canonization of Luigi Scrosoppi, Agostino Roscelli, Bernardo da Corleone, Teresa Eustochio Verzeri & Rafqua Pietra Choboq Ar-Rayès), the Great Jubilee 2000, 1999, 1998, 1997, 1996 (at the canonization of Jean-Gabriel Perboyre, Egidio Maria di San Giuseppe & Juan Grande Román), 1995 (50th anniversary of end of WWII), 1994, 1993 (at the conclusion of Familyfest), 1992, 1991, 1990, 1989, 1988, 1987, 1986, 1985, 1984, 1983, 1982, 1980 (in France) & 1979.
St John Paul II gave us his encyclical Slavorum Apostoli on the Solemnity of the Most Holy Trinity, 2nd June 1985.
The one God is the ineffable and most Holy Trinity:
Father, Son and Holy Spirit 
Catechesis by St JPII: "1. The Church professes her faith in the one God, who is at the same time the Most Holy and ineffable Trinity of Persons: Father, Son and Holy Spirit. And the Church lives of this truth, contained in the most ancient symbols of faith, and recalled in our times by Paul VI, on the occasion of the 1900th anniversary of the martyrdom of the holy apostles Peter and Paul (1968), in the symbol presented by him and universally known as the "Credo of the People of God".
Only "the One, who has wished to make Himself known to us and who 'dwelling in light inaccessible' (1 Tim 6, 16) is in Himself above every name, above all things and above every created intelligence ... can give us right and full knowledge of Himself, revealing Himself as Father, Son and Holy Spirit, in whose eternal life we are called by his grace to participate, here below in the obscurity of faith and, beyond death, in perpetual light...".
2. God, who for us is incomprehensible, has wished to reveal Himself, not only as the one creator and omnipotent Father, but also as Father, Son and Holy Spirit. In this revelation the truth about God, who is love, is revealed in its essential source: God is love in the very interior life of a single divinity. This love is revealed as an ineffable communion of Persons."
3 2us with Mgr Leo Maasburg 
"Our heart is built according to the Trinity, our love is built according to the Trinitarian love. All nature has a trinitarian character, one could say a genetic character of the Trinity, a fingerprint of the Trinity - from the nuclear structure to heaven and earth, from man and woman to all the laws of the universe."
3 2us with Fr Francis Selman
"The Father, the Son and the Holy Spirit are not only in one another but they are also in us: “In that day you will know that I am in my Father, and you in me, and I in you” (Jn 14, 20). This is especially true of the Eucharist when, through communion, Christ is in us and we in Christ. If Christ is in us, and the Father is in him, the Father is in us. As the Father and the Son are never without their love, who is the Holy Spirit, the Holy Spirit is also given to us with them as the Gift of their love."
Sunday Evangelium with Fr Andrew Pinsent
"Human reason can help to clear away erroneous conceptions of the Trinity, and it is also possible to trace the fruits of the Trinity for our civilisation, but to know the Holy Trinity personally we need ourselves to become holy."
