"The summit of the Apostles..."

St. John the Evangelist and Theologian (source)

  
The summit of the Apostles, the trumpet of theology, the spiritual general, who made the whole inhabited world subject to God, come believers, let us call him blessed, revered John, translated from earth, yet not withdrawn from earth, but living and abiding the fearful second coming of the Master. O mystic bosom friend of Christ, ask that we, who celebrate your memory with love, may meet it uncondemned.
-Idiomelon of the Litia in the Second Tone
  
(source)
  

Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!