Two years ago, I noticed a feature in "Jesus Came, the Heavens Adoring," specifically with regard to the second musical phrase from the tune "Sieh, hier bin ich" ("Behold, here I am"):
There's a cross inscription in the tune, and this connects with the text in the third verse: "Bringing news of sins forgiv'n." Jesus' death on the cross is what gives us this forgiveness of sins.