I believe in one God, the Father Almighty, Maker of Heaven and Earth and of all things visible and invisible.
And in one Lord Jesus Christ, the Son of God, the only-begotten, begotten of the Father before all ages. Light of light; true God of true God; begotten, not made; of one essence with the Father, by Whom all things were made; Who for us men and for our salvation came down from Heaven, and was incarnate of the Holy Spirit and the Virgin Mary, and became man. And He was crucified for us under Pontius Pilate, and suffered, and was buried. And the third day He arose again, according to the Scriptures, and ascended into Heaven, and sits at the right hand of the Father; and He shall come again with glory to judge the living and the dead; Whose Kingdom shall have no end.
And in the Holy Spirit, the Lord, the Giver of Life, Who proceeds from the Father; Who with the Father and the Son together is worshipped and glorified; Who spoke by the prophets.
In one Holy, Catholic, and Apostolic Church. I acknowledge one baptism for the remission of sins. I look for the resurrection of the dead and the life of the world to come. Amen.
The Nicean-Constantinopolitan Creed brings together the essentials of the Christian faith. The Creed was developed by the Church during the fourth century, and remains part of both public worship and private devotions for Orthodox Christians. You can read more about the Creed, the Symbol of the Faith, here and here.
This icon is the famous The Hospitality of Abraham by Andrei Rublev. It depicts Abraham's three angelic visitors (Genesis 18), who are themselves understood to represent the Holy Trinity.