The readings for this Sunday are:
http://www.cpdl.org/wiki/index.php/Category:Pentecost_IV
1 Samuel: Saul is getting pretty jealous of David’s military victories and the resulting praise from the Israelites.
Psalm 138: a song of thanksgiving and praise to God, for preservation from and victory over one’s enemies.
Genesis 3:8-15: The man and the woman (that’s Adam and Eve), having eaten of the tree God told them not to, know that they are naked, and hide from God when he calls them. The man blames “the woman who you gave to me” for tricking him into eating the fruit; the woman blames the snek serpent. God curses the serpent.
Psalm 130: a song of waiting for divine redemption, waiting on God’s word in hope.
2 Corinthians 4:13-5:1: waiting in faith for the glory of resurrection — the one who raised the Lord Jesus will raise us also with Jesus.
Mark 3:20-35: Pharisees saying that Jesus has demons in him and that’s why he can cast them out; Jesus’s denouncement of blasphemy against the Holy Spirit; relationship to Jesus through doing the will of God: ‘Whoever does the will of God is my brother and sister and mother.’
The connection is a bit tenous, but Cecilia McDowell’s De Profundis (Night Raid) does draw on Psalm 130. It’s really a commemoration of WWI, though, so probably only suitable if you happen to be looking at that this Sunday.
Also using the Related set of readings, you could go with a Salve Regina — particularly for the reference to humankind as “poor banished children of Eve”, and the sense of waiting for redemption. Here’s one by Jocelyn Hagen.
Another piece which focuses on this faithful waiting for God is As the Pauper Waits for Plenty by Rosalie Bonighton.