"Yet what I can give Him: give my heart"

I woke up this morning humming this carol. I didn't really know all the lyrics so I looked them up. They were written by Christina Rossetti and are quite beautiful.

In the Bleak Mid-Winter

In the bleak midwinter,
frosty wind made moan,
Earth stood hard as iron,
water like a stone;
Snow had fallen,
snow on snow,snow on snow,
In the bleak midwinter, long ago.

Our God, heaven cannot hold Him,
nor earth sustain;
Heaven and earth shall flee away
when He comes to reign.
In the bleak midwinter
a stable place sufficed
The Lord God Almighty, Jesus Christ.

Angels and archangels
may have gathered there,
Cherubim and seraphim
thronged the air;
But His mother only,
in her maiden bliss,
Worshipped the beloved with a kiss.

What can I give Him,
poor as I am?
If I were a shepherd,
I would bring a lamb;
If I were a Wise Man,
I would do my part;
Yet what I can give Him: give my heart.