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Be Thou my vision, O Lord of my heart; Naught be all else to me, save that Thy art. Thou my best thought, in the day and the night, Waking or sleeping, Thy presence my light. Be Thou my Wisdom, Be Thou my true Word; I ever with Thee and Thou with me, Lord; Thou my great Father and I thy true son; Thou in me dwelling and I with Thee one. Be Thou my breastplate, my sword for the fight, Be Thou my armor and Be Thou my Might- Thou my soul's shelter and Thou my high tower: Raise Thou me heavenwards, O Power of my power! Riches I need not, nor man's empty praise, Thou mine inheritance through all of my days: Thou and Thou only, first in my heart, High King of heaven, my Treasure Thou art. Oh High King of heaven, When Battle is Done, Grant Heav'ns Joy to me, bright heav'ns Son! Christ of my own heart, whatever befall, Still be my vision, Thou ruler of all. Be Thou my vision, O Lord of my heart; Naught be all else to me, save that Thy art. Thou my best thought, in the day and the night, Waking or sleeping, Thy presence my light. Waking or sleeping, Thy presence my light. Still be my vision, Thou ruler of all.

From en.wikipedia.org/wiki/Be_Thou_My_Vision

"Be Thou My Vision -Irish: Bí Thusa 'mo Shúile- is a traditional Christian hymn, which can be traced to Ireland but is now sung in English-speaking churches around the world."

The original Old Irish text, Rop tú mo Baile is often attributed to Dallan Forgaill in the 6th Century. The text had been a part of Irish monastic tradition for centuries before its setting to the tune, therefore, before it became an actual hymn. It was translated from Old Irish into English by Mary E. Byrne, M.A., in Ériu (the journal of the School of Irish Learning), in 1905. The English text was first versified by Eleanor H. Hull, in 1912, and is now the most common text used.