If life is a mystery, then certainly, God is a mystery. No one has seen God except Jesus. The basic tenet of Christian faith is belief in the Holy Trinity. It is the central and foundational belief on which is built the rest of the edifice of dogmas and doctrines of the Church. St Basil of Caesarea wrote "When I think of the One, I think of the Three, and when I think of the Three, I think of the unity." Most Holy Trinity Sunday invites us to reflect deeply on the central mystery of our Christian faith—the Trinity. God reveals Himself as Father, Son, and Holy Spirit: three persons, one essence. This profound mystery calls us to a deeper understanding and experience of God’s nature, relationship, and love.