2 “We will confess to You, O Lord, we will confess to You, and will invoke Your name”. Do not invoke, before thou confess: confess, and invoke. For Him whom you are invoking, unto yourself you call. For what is it to invoke, but unto yourself to call? If He is invoked by you, that is, if He is called to you, unto whom does He draw near? To a proud man He draws not near. High indeed He is, one lifted up attains not unto Him. In order that we may reach all exalted objects, we raise ourselves, and if we are not able to reach them, we look for some appliances or ladders, in order that being exalted we may reach exalted objects: contrariwise God is both high, and by the lowly He is reached.
It is written, “Nigh is the Lord to them that have bruised the heart.” The bruising of the heart is Godliness, humility. He that bruises himself is angry with himself. Let him make himself angry in order that he may make Him merciful; let him make himself judge, in order that he may make Him Advocate. Therefore God does come when invoked. Unto whom does He come? To the proud man He comes not....Take heed therefore what ye do: for if He knows, He is not unobservant. It is better therefore that He be unobservant than known.
For what is that same being unobservant, but not knowing? What is, not to know? Not to animadvert. For even as the act of one avenging animadversion is wont to be spoken of. Here one praying that He be unobservant: “Turn away Your face from my sins.” What then will you do if He shall have turned away His face from you? A grievous thing it is, and to be feared, lest He forsake you. Again, if He turn not away His face, He animadverts. God knows this thing, God can do this thing, namely, both turn away face from one sinning, and not turn away from one confessing....Confess therefore and invoke.
For by confessing you purge the Temple, into which He may come, when invoked. Confess and invoke. May He turn away face from your sins, not turn away from you: turn away face from that which you have wrought, not turn away from that which He has Himself wrought. For you, as man, He has Himself wrought, your sins you have yourself wrought....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)