The article reports that when one thinks of the Holy Trinity and the saints, the experiences of mystical visions come to mind first, such as that of Saint Ignatius of Loyola, the founder of the Jesuits, who had a very clear vision of the three divine Persons. Topics include examines the saint, immediately after, heard a voice that told her that God, in his essence, no one will know and if the Trinity cannot be fully understood, it can nevertheless be lived in depth.