Be Thou My Vision

One of my favorite hymns, sung to the tune of Slane:

Here are the lyrics  from the 1982 Hymnal of the Episcopal Church, slightly different from those in the video:

Be Thou my vision, O Lord of my heart;
all else be nought to me, save that thou art--
Thou my best thought, by day or by night,
waking or sleeping, thy presence my light.

Be thou my wisdom, and thou my true word;
I ever with thee, and thou with me Lord,
thou my great Father; thine own may I be;
thou in me dwelling, and I one with thee.

High King of Heaven, when victory is won,
may I reach heaven's joys, bright heaven's Sun!
Heart of my heart, whatever befall,
still be my vision, O Ruler of All!