40 “When you open Your hand, they shall all be filled with good”. What is it, O Lord, that You open Your hand? Christ is Your hand. “To whom is the arm of the Lord revealed?” To whom it is revealed, unto him it is opened: for revelation is opening. “When You open Your hand, they shall all be filled with good.” When Thou revealest Your Christ, “they shall all be filled with good.” But they have not good from themselves; this is oftentimes proved unto them. “When Thou hidest Your face, they are troubled”. Many filled with good have attributed to themselves what they had, and have wished to boast as in their own righteousnesses, and have said to themselves, I am righteous; I am great: and have become self-complacent. Unto these the Apostle speaks: “What have you, that you did not receive?” But God, wishing to prove unto man that whatever he has he has from Him, so that with good he may gain humility also, sometimes troubles him; He turns away His face from him, and he falls into temptation; and He shows him that his righteousness, and his walking aright, was only under His government....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)