Despite the Wiccan style theology (Maiden/Mother/Crone) I thought the prayers were beautifully written so I couldn't resist. I started saying the prayers that night and have continued since. Sometimes I miss one or two, but for the most part I've been doing it pretty faithfully.
I don't if this could "count" for mental discipline. I find it's easier to remember to do than sitting meditation and it's easier to focus on- more concrete. Regardless of whether it works for the DP I enjoy doing it, and find it helps me keep incorporate spirituality into my day.