Gregory of Nyssa

When the great David served as interpreter for the Spirit, he related in his song the things that he had previously learned, and if he was taught something additional while he was speaking, he submitted to the Spirit who was making the hearing of his soul resound and stopped the music, and when he was filled with these thoughts he related these matters, again entwining the words with the melody. One who has comprehended the term in a definition might say, then, that diapsalma is a pause that occurs suddenly in the midst of the singing of a psalm in order to receive an additional thought that is being introduced from God. Or, one might rather define it as follows. diapsalma is a teaching from the Spirit that occurs in a mysterious manner in the soul, when the attention given to this new thought impedes the continuity of the song.… In the third psalm he spoke first about the distress and hardship that occurred when his enemies "rose up against" him. Then he separated that part with the diapsalma and put his trust in the one who was causing that sound of salvation to resound mysteriously in him and said, "But you, Lord, are my protector, my glory, and the lifter up of my head." Again, when he has stopped the music, saying, in accordance with that gracious voice that he has made his own, "I cried to the Lord with my voice, and he heard me from his holy mountain," he is taught what the solution is for the hardship that is common to human ills. And after he has been taught the mystery related to the passion of the Lord in the sudden illumination of the Spirit, he assumes the character of the Lord and says, "I lay down and slept, and I was raised, because the Lord will help me."