Thanks to Florin Puscas for this superb link.
UPDATE: See below the text of this superb Celtic blessing.
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May the Blessing of Light be upon you, light on the outside, light on the inside.
With God’s sunlight shining on you, may your heart glow with warmth,
like a turf fire that welcomes friends and strangers alike.
May the light of the Lord shine from your eyes,
like a candle in the window, welcoming the weary traveler.
May the blessing of God’s soft rain be on you, falling gently on your head,
refreshing your soul with the sweetness of little flowers newly blooming.
May the strength of the winds of heaven bless you,
carrying the rain to wash your spirit clean, sparkling after in the sunlight.
May the blessing of God’s earth be on you, and as you walk the roads,
may you always have a kind word for those you meet.
May you understand the strength and power of God in a thunderstorm in winter,
and the quiet beauty of creation, and the calm of a summer sunset.
And may you come to realize that insignificant as you may seem in this great universe,
you are an important part of God’s plan.
May He watch over you, and keep you safe from harm.