Office of Tenebrae of Holy ThursdayAt the end of each psalm a candle from the fifteen-branched candlestick is extinguishedThe sisters sing the psalms from their stallsThe Lessons are sung by the clericsAt the end of the Office the last candle, representing Our Lord Jesus Christ, is hidden behind the altar. This illustrates the disappearance of the "Light of the World" (Jn VIII, 12) at Our Lord’s death.At the altar of repose, before Tenebrae of Good FridayResponses sung by the professed sistersThe candles on the altar are extinguished during the Benedictus