Francisca Rumsey uses two case studies from early Christian Ireland, the Nauigatio sancti Brendani abbatis and the Rules of the Celi De to demonstrate two different ways of understanding sacred time. One sees time as part of a good and holy creation, and therefore intrinsically good in itself; the other sees time as part of a fallen world needing redemption, and therefore in need of sanctification. The Celi De are often presented as part of a reform movement in early Irish monasticism. This question of monastic 'reform' is explored in detail to show that the received position regarding the Celi De is inaccurate. In fact, in the specific issue of liturgical prayer, their approach was innovative to the point of idiosyncrasy.