9 “Whose sons are like young vines firmly planted in their youth”. He wishes to recount their happiness. Observe, you sons of light, sons of peace: observe, you sons of the Church, members of Christ; observe whom he calls “strangers,” whom he calls “strange children,” whom he calls “waters of contradiction,” whom he calls a “sword of ill intent.” Observe, I beseech you, for among them you are in peril, among their tongues ye fight against the desires of your flesh, among their tongues, set in the hand of the devil wherewith he fights....What vanity has their mouth spoken, and how is their right hand a right hand of iniquity?
“Their daughters are fitted and adorned after the similitude of a temple.” “Their garners are full, bursting out from one store to another: their sheep are fruitful, multiplying in their streets”: “their oxen are fat: their hedge is not broken down, nor their road, nor is their crying in their streets”. Is not this then happiness? I ask the sons of the kingdom of heaven, I ask the offspring of everlasting resurrection, I ask the body of Christ, the members of Christ, the temple of God.
Is not this then happiness, to have sons safe, daughters beautiful, garners full, cattle abundant, no downfall, I say not of a wall, but not even of a hedge, no tumult and clamour in the streets, but quiet, peace, abundance, plenty of all things in their houses and in their cities? Is not this then happiness? Or ought the righteous to shun it? Or do you not find the house of the righteous too abounding with all these things, full of this happiness? Did not Abraham's house abound with gold, silver, children, servants, cattle?
What say we? Is not this happiness? Be it so, still it is on the left hand. What is, on the left hand? Temporal, mortal, bodily. I desire not that thou shun it, but that thou think it not to be on the right hand....For what ought they to have set on the right hand? God, eternity, the years of God which fail not, whereof is said, “and Your years shall not fail.” There should be the right hand, there should be our longing. Let us use the left for the time, let us long for the fight for eternity. “If riches increase, set not your heart upon them.”...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)