7 What next? “Neither iniquity is mine, nor sin mine, O Lord”. There have rushed on indeed strong men on their own righteousness relying, they have rushed on, but sin in me they have not found. For truly those strong men, that is, as it were righteous men, on what account would they be able to persecute Christ, unless it were as if a sinner? But, however, let them look to it how strong they be, in the raging of fever not in the vigour of soundness: let them look to it how strong they be, and how as though just against an unrighteous man they have raged. But, however, “neither iniquity is mine, nor sin mine, O Lord. Without iniquity I did run, and I was guided.” Those strong men therefore could not follow me running: therefore a sinner they have deemed me, because my steps they have not seen.
8. “Without iniquity I did run, and was guided; rise up to meet me, and see.” To God is said this. But why? If He meet not, is He unable to see? It is just as if you were walking in a road, and from afar by some one you could not be recognised, you would call to him and would say, Meet me, and see how I am walking; for when from afar you espy me, my steps you are not able to see. So also unless God were to meet, would He not see how without iniquity he was guided, and how without sin he was running? This interpretation indeed we can also accept, namely, “Rise up to meet me,” as if “help me.” But that which he has added, “and see,” must be understood as, make it to be seen that I run, make it to be seen that I am guided: according to that figure wherein this also has been said to Abraham, “Now I know that you fear God.” God says, “Now I know:” whence, but because I have made you to know? For unknown to himself every one is before the questioning of temptation: just as of himself Peter in his confidence was ignorant, and by denying learned what kind of powers he had, in his very stumbling he perceived that it was falsely he had been confident: he wept, and in weeping he earned profitably to know what he was, and to be what he was not. Therefore Abraham when tried, became known to himself: and it was said by God, “Now I know,” that is, now I have made you to know. In like manner as glad is the day because it makes men glad; and sad is bitterness because it makes sad one tasting thereof: so God's seeing is making to see. “Rise up, therefore,” he says, “to meet me, and see”. What is, “and see”? And help me, that is, in those men, in order that they may see my course, may follow me; let not that seem to them to be crooked which is straight, let not that seem to them to be curved which keeps the rule of truth.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)