Augustine. Exposition on the Book of Psalms. Schaff, Philip (editor). New York: Christian Literature Publishing Co, 1886. Nicene and Post-Nicene Church Fathers: Series 1: Volume VIII. Re-published 2014, Catholic Way Publishing. Kindle electronic edition, ISBN-13: 978-1-78379-372-3.
Psalm 134 very briefly calls God's people, who stand in His courts, to praise the Lord (vv. 1-2). Augustine considers the term "courts" of the Lord's house to be significant. Here he finds not a constrained area but a large place (Augustine Psalms, loc. 341299, par. 1). Here the enemy cannot threaten. We find ourself in the presence of the Lord but not limited.
Verse two further speaks of blessing the Lord at night. Augustine takes night to be the sad time, when it may be more difficult to bless the Lord (Augustine Psalms, loc. 341304, par. 2). He gives several brief examples of blessing the Lord during times of trial.
Finally, in verse three, the Lord makes His blessing known. He is the source of blessing (Augustine Psalms, loc. 341314, par. 3).