william helmcke argues that the devoutly catholic górecki derived the main motives in "totus tuus" from poland's oldest hymn, bogurodzica (helmcke 2014, 136). these motives are a descending perfect fourth (from notes 3-6 of bogurodzica); the vertical presentation of that fourth, which explains the numerous second inversion chords; incomplete neighbour (from notes 1-2 of bogurodzica]; complete neighbour (from notes 5-7 of bogurodzica); and voice exchange, which functions as augenmusik (ibid, 137).