19 “The Eyes of the Lord are upon the righteous:” fear not then; labour; the eyes of the Lord are upon you. “And His Ears are open unto their prayers”. What would you more? If an householder in a great house should not hearken to a servant murmuring, he would complain, and say, What hardship do we here suffer, and none hears us. Can you say this of God, What hardships I suffer, and none hears me? If He heard me, haply, do you say, He would take away my tribulation: I cry unto Him, and yet have tribulation.
Only do thou hold fast His ways, and when you are in tribulation, He hears you. But He is a Physician, and still have you something of putrefaction; you cry out, but still He cuts, and takes not away His Hand, until He has cut as much as pleases Him. For that Physician is cruel who hears a man, and spares his wound and putrefaction. How do mothers rub their children in the baths for their health. Do not the little ones cry out in their hands? Are they then cruel because they spare not, nor hearken unto their tears? Are they not full of affection? And yet the children cry out, and are not spared. So our God also is full of charity, but therefore seems He not to hear, that He may spare and heal us for everlasting.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)