Fully Man, Fully God

I recevied this in a e-card from some close friends today:

Welcome, all wonders in one sight!
Eternity shut in a span!
Summer in winter!
Day in night!
Heaven in earth!
And God in man!
Great Little One, whose all-embracing birth,
Lifts earth to heaven,
stoops heaven to earth.
(Richard Crashaw – 1612-1649)