As a bookmark for whatever book he happened to be reading, he always used a strip of paper with this motto written on it in a bold and energetic hand: Ure igne Sancti Spiritus! —You could almost say that, rather than writing the words, he had engraved them: Inflame with the fire of the Holy Spirit!

O Christian, engraved on your soul and burning on your lips and caught fast in your works, I would like to leave that divine fire.