This peace prayer is not Christian in origin. It actually comes from the Druids, who according to the Order of Bards Ovates & Druids, often say it in their ceremonies. However, since it leaves it up to you which divinity you are addressing it to, I would suggest it it is a prayer we can all join in praying.
Deep within the still centre of my being
May I find peace.
Silently within the quiet of the grove
May I share peace.
Gently (or powerfully) within the greater circle of humankind
May I radiate peace.
Curious Christian 