"Sing with All the Saints in Glory"

On Worship Anew a couple weeks ago (18 November, Twenty-Third Sunday after Pentecost), the Gospel reading was from Luke 21.  In his sermon, Pastor Jonker alluded to verse 28 a couple times:  "'Now when these things begin to take place, straighten up and raise your heads, because your redemption is drawing near.'"  This seems to be referenced in the line "Child of God, lift up your head!" in the third verse of "Sing with All the Saints in Glory."

(Here's a link to my post about the Biblical sources.)