"How Wide the Love of Christ"

While transcribing hymns months ago, I came across a cross inscription that I'd previously noted in my hymnal.  It's in the first phrase of the tune "Swabia":

The hymn sung to "Swabia" is "How Wide the Love of Christ."  Each of the first four verses begins with a line with this same structure:  "How wide the love of Christ," "How long the love of Christ," "How high the love of Christ," and "How deep the love of Christ."  The cross inscription in the tune hints at Christ's crucifixion, which is an-other sign of His love.  The fourth verse later mentions it specifically: "Descending to a cross! / He bears within His wounded hands / All human pain and loss."