Sunday of the 318 Holy Fathers of the First Ecumenical Council - Nicea 325AD
Jesus spoke these words, lifted up His eyes to heaven, and said: "Father, the hour has come. Glorify Your Son, that Your Son also may glorify You, as You have given Him authority over all flesh, that He should give eternal life to as many as You have given Him.
And this is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent.
I have glorified You on the earth. I have finished the work which You have given Me to do. And now, O Father, glorify Me together with Yourself, with the glory which I had with You before the world was. I have manifested Your name to the men whom You have given Me out of the world. They were Yours, You gave them to Me, and they have kept Your word. Now they have known that all things which You have given Me are from You. For I have given to them the words which You have given Me; and they have received them, and have known surely that I came forth from You; and they have believed that You sent Me. I pray for them. I do not pray for the world but for those whom You have given Me, for they are Yours. And all Mine are Yours, and Yours are Mine, and I am glorified in them. Now I am no longer in the world, but these are in the world, and I come to You.
Holy Father, keep through Your name those whom You have given Me, that they may be one as We are.
While I was with them in the world, I kept them in Your name. Those whom You gave Me I have kept; and none of them is lost except the son of perdition, that the Scripture might be fulfilled. But now I come to You, and these things I speak in the world, that they may have My joy fulfilled in themselves.
The Holy Gospel According to Saint John the Theologian - Chapter 17:1-13
Commentary - Saint Theophan the Recluse
Arias began to deny the divinity of the Son of God and His oneness in essence with God the Father. The entire Church rose up against him; all believers, from all ends of the earth, unanimously confessed that the Lord Jesus Christ is the Only-Begotten Son of God, true God of true God; begotten, not made, of one essence with the Father. One would think that this unanimity was purely coincidental, but this faith was then tried by fire when the authorities and powerful of this world began to side with the Arians. Neither fire, nor sword, nor persecution could extinguish this faith, and it was immediately found everywhere among everyone, as soon as the pressure from external powers ceased. This means that it makes up the heart of the Church and the essence of her confession. Glory be to the Lord, Who preserves this faith within us! For, as long as it exists, we are still Christians, though we may not live as such. If it ceases to exist, Christianity will end.