Those who knew Maurice best were deeply impressed with the spirituality of his character.
Human spirituality which sought its ideal in the rejection of all that the world could give.
His homiletic books, Epistle on Sanctity (Iggereth ha-qodesh) and Law of Man (Torath ha-Adam), which deal respectively with the sanctity of marriage and the solemnity of death, are full of intense spirituality, while at the same time treating of ritual customs - a combination which shows essential Rabbinism at its best.
Already in the 9th century there were several protests against the rigidity and want of spirituality of a purely sacerdotal church.
Spirituality informs his inspiration; the poetry is of the finest elements, glowing and alive.