Let Mar Odisho explain the Holy Trinity for you. I noticed the sun analogy from the Marganitha being used in that website. Further proof the COE taught the Western Church.
On the Trinity
Everything that exists must be either a material body whose existence is the subject of accidents and changes, and is acted upon by whatever is opposed to it; or not a body, and consequently not the subject of any of these things. Now, we have already proved, that God (glory be to His incomprehensibility) is not a body and therefore is not subject to anything pertaining to materiality, from which He is infinitely removed. Whatever is immaterial, and not subject to anything appertaining to matter, the traditions of the ancients call Mind. And whatever is exclusive of matter, and of what appertains thereto, must be knowing, and must know himself, because himself is ever present and known to him, and it is not dependent on anything but itself. And whatever knows its essence must be living. Therefore God is Wise and Living. Now, he who is wise discerns because of his wisdom; and he who is living is living because he has life. This is the mystery of the Trinity, which the Church confesses of that Adorable Nature, Mind, Wisdom and Life. Three co-essential properties in One, and One who is glorified in three properties. The Mind (the Church) has called Father and Begetter, because He is the Cause of all, and First. The Son (She) has called Wisdom and Begotten, because He is begotten of the Mind, and by Him everything was made and created. The Life (She) has called, the Holy Spirit and Proceeding, because there is no other Holy Spirit but He. He who is Holy is unchangeable, according to the interpretation of received expositors; and this is that which is declared by John the Divine, the son of Zebedee: “In the beginning was the Word;” and, “the Life is the light of men”. Now in the manner of the soul which is possessed of three-fold energy; mind, word, and life, and is one and not three; even so should we conceive of the THREE IN ONE, ONE IN THREE. The sun also, which is one in its disk, radiance, and heat, is another simile adduced by the second Theologus Paul, the chosen vessel: “He is the brightness of His glory, and the Express Image of His being;” and, again: “Christ, the power of God, and the wisdomof God “. Further, everything that exists is either an accident or a substance. But the Self-existent can in no wise be susceptible of accident. Therefore these three properties are consubstantial and are on this account called (Qnume) hypostasis or substance and not accidental powers, nor do they cause change in the nature of the consubstantial nor plurality; for He is the Mind, the Same He is the Wisdom, the Same He is the Life, Who ever begat without cessation, and puts forth (makes to proceed) without removal from Himself. These things (cessation removal) are infinitely removed from Him for there is no real likeness between created natures and the Nature of the eternally existing and a simile does not in everything resemble that which is compared by it; for then the simile and that which is compared by it would be the thing itself, and we (who have just instituted several comparisons) would not be unlike the man who attempts to compare a thing by the self-same thing. The mystery of the Trinity is expressed in the words of the Old Testament: “Let us make man in our own image, after our likeness;” the occurrence of the letter noonthree times in this sentence is an indication of the Trinity. The “Holy” thrice repeated in the seraphic hymn, as mentioned by Isaiah, joined with one “Lord “, attests Three Qnume in One nature. The words of David, also, are of ‘the same import: “By the Word of the Lord were the heavens made, and all the host of them by the breath of His mouth;” and many other like references. Let the heathen, then, and Jews who rail at the truth of the Catholic Church, on account of her faith in the Trinity, be confounded and put to shame. Here endeth the first part.