Prayer and Mantras
Mantras are prayers, usually of few words, which are meant to be repeated again and again, during which time you feel different levels and aspects of the meaning of the words. Being a focus for thought and love, the mantra (like prayer) will cause powerful transformations. (Besides the Great Invocation, the next is my favorite mantra.)
May i be as God Wills
in all realms,
in all space,
in all time.
In God, we Love.
In God, we Live.
In God, we Trust.
Dear Lord, may I receive and give as God wills.
Dear Lord, may I work and rest as God wills.
Dear Lord, may I love and forgive as Jesus loves and forgives.

(courtesy of www.LouixDorDempriey.com)
There are many sacred mantras in many languages, e.g.
and
and of course, there is the Serenity Prayer.
Pick up any hymn book, and you are sure to find poetic lines of beauty which will also resonate with you when you ernestly say or sing them repeatedly.