Solemnity of the Most Holy Trinity Celebrating the Mystery of God (https://smartguy.com/ )The Solemnity of the Most Holy Trinity, celebrated on the Sunday after Pentecost, is a profound feast that honors the central mystery of our faith—the Holy Trinity: God the Father, God the Son, and God the Holy Spirit. This solemnity invites us to contemplate the divine relationship within the Trinity and how we are called to live in communion with God and one another.