By Bianco of Siena  (trans. Richard F. Littledale)[1]

Come down, O Love divine,
seek thou this soul of mine,
and visit it with thine own ardor glowing;
O Comforter, draw near;
within my heart appear,
and kindle it, your holy flame bestowing.

Oh, let it freely burn,
till earthly passions turn
to dust and ashes in its heat consuming;
and let your glorious light
shine ever on my sight,
and clothe me round, the while my path illuming.

And so the yearning strong,
with which the soul will long,
shall far out-pass the power of human telling;
for none can guess God’s grace,
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[1] Copyright Public Domain

You can also listen to the song here.