This triangle and cicrcle is the usual explanation we have learnt in our Catechism about The Holy Trinity. The mudras representation in Fr TR's painting is much more helpful for contemplation.We have always thought it is simply a mystery which we might understand in the next life but not this. St Augustine tried to attempt to explain the Trinity, to satisfy the scriptural directive to "seek His face evermore".
His book "The Trinity" begins with a consideration of the Scriptural references to the Trinity, with the aim of reconciling them and explaining them through the supposition of three equal persons in one God. Augustine is at particular pains to maintain the equality of the persons: that the Son is equal to the Father, and the Holy Spirit equal to both. His approach is to use the fact that Man was created in the image of God. Given this, Augustine reasons, there should be some image of the Trinity in man. This leads to the consideration of a succession of trinities - the lover, beloved, and love; memory, understanding, and will; the objects of sense, the will to attend to them, and the sense impressions of them; etc. The trinities in man are held up not as exact analogues to that in God, but as a ladder, starting with the most carnal and rising towards the most spiritual; we do not find a single Trinity like that of God within ourselves, but we do find a series of them that we can ascend, and in ascending it we approach the divine Trinity and a deeper understanding of God.
His book "The Trinity" begins with a consideration of the Scriptural references to the Trinity, with the aim of reconciling them and explaining them through the supposition of three equal persons in one God. Augustine is at particular pains to maintain the equality of the persons: that the Son is equal to the Father, and the Holy Spirit equal to both. His approach is to use the fact that Man was created in the image of God. Given this, Augustine reasons, there should be some image of the Trinity in man. This leads to the consideration of a succession of trinities - the lover, beloved, and love; memory, understanding, and will; the objects of sense, the will to attend to them, and the sense impressions of them; etc. The trinities in man are held up not as exact analogues to that in God, but as a ladder, starting with the most carnal and rising towards the most spiritual; we do not find a single Trinity like that of God within ourselves, but we do find a series of them that we can ascend, and in ascending it we approach the divine Trinity and a deeper understanding of God.
-from a student.