A Celtic Christian prayer, from Scotland:

BE THOU MY VISION

Be Thou my Vision, O Lord of my heart:
Naught is all else to me, save that Thou art,
Thou my best thought, by day and by night,
Waking or sleeping, Thy presence my light.

Be Thou my wisdom, Thou my true Word,
I ever with Thee, Thou with me Lord.
Thou my great Father, I Thy dear son
Thou in me dwelling, I with Thee one.

A-men.

Ancient Irish