James O'Leary, The Most Ancient Lives of Saint Patrick… (1874)
“ A certain abbot, a disciple of Saint Patrick, named Colmanus, was accustomed frequently to repeat this hymn; and when he was asked of the disciples why he would not rather sing the appointed offices and psalms, inasmuch as once to sing this hymn ought to suffice him, he continually beheld the face of his beloved father, Patrick, nor could he ever be satisfied with the contemplation thereof. ”
