I almost can hear an angel warning that we had better 'rejoice'..that is, accept, the Messiah, because the angel knows the very great cost at which our salvation will come about.
hu.wikipedia.org/wiki/J%C3%B6jj_el,_j%C3%B6jj_el,_Emmanuel azt nem tudtam, de jó hangzik :) Zoltán Kodály wrote a choral work "Adventi ének (Advent song: Veni, veni Emmanuel)" in 1943 based on the melody and sung mostly with Latin or Hungarian lyrics.