Celtic Blessing

I came across this blessing today, at a funeral, and loved the imagery of the words.  I don't know who wrote it, but I hope I shan't break any copyrights by sharing it :-

May the blessing of the rain be on you,
the soft sweet rain.
May it fall upon your spirit,
so that all the little flowers may spring up,
and shed their sweetness on the air.
May the blessing of the great rains be on you,
may they beat upon your spirit
and wash it fair and clean,
to leave there many a shining pool
where the blue of heaven shines,
and sometimes a star.