St. Gertrude and the Liturgy

When Vespers was intoned, the Son of God, holding in his two hands his most benign and worthy Heart, offered it, under the form of a harp, before the gaze of the glorious Trinity. All the devotion and all the words sung during the feast resounded there sweetly. Those who were chanting the Psalms wthout particular devotion, but only from routing, or even with a purely human satisfation, produced only a muffled murmuring on the lowest strings. But as for those who were devotedly applying themselves to chanting the praise of the venerable Trinity, these seemed to make resound in the depths of the most holy Heart of Jesus Christ a sublime melody and most sweet sounds on the more resonant strings.
(Book IV, XLI, 2, 1-12)

 

During the morning Office, as the Lauds antiphon Te jure laudant was being sung, with all her strength she sang the praises, through this same antiphon, of the most venerable Trinity; and this she did with a great deal of joy, wishing, if it were possible, to sing this antiphon at the moment of her death agony with so great a devotion that, in so doing, she would consume the rest of her strength, and thus die while praising God. It seemed to her then that the wholly resplendent and ever tranquil Trinity deigned to incline towards the most noble Heart of Jesus. In the presence of this most holy Trinity, the Heart was like a harp plucked with wondrous skill, and sweetly resounding. Gertrude looked steadily at three of the strings which, unceasingly, and in conformity with the sovereign omnipotence of God the Father, and with the wisdom of God the Son, as with the benificent will of the Holy Spirit, were to satisfy for all her failings, for the good pleasure of the Blessed Trinity.
(Book IV, XLI, 4)