"as the wind upon the sea"

Heather wrote a song (to the tune of the Irish folk song, "Down by the Sally Gardens"). I like it:

Come to me, all ye heavy laden,
all ye weary from the road.
Rest your head upon my shoulder
and let me take your load.
For see, my yoke is easy,
my burden very light,
as the sunlight on the meadow,
as the south wind in the night.

Leave behind your anxious labor,
follow me, I will care for you.
For the name of my yoke is freedom
and all my words are true.
Oh leave behind your money,
your glory, let it pass,
as the rain upon the river,
as the dew upon the grass.

Come and drink of my still waters,
without money, without gold.
Of the light in my green valley
no tongue has ever told.
Oh turn and be like children
where my children's laughter runs free,
as the stream upon the mountain,
as the wind upon the sea.