“God be merciful to me a sinner.”- Luke 18:13

Did the publican ever think about going to the priest to ask for mercy, and confessing his sins? The thought may have crossed his mind, but his sin was too great a weight upon his conscience to be relieved in any such way, so he very soon dismissed the idea. “No,” saith he, “I feel that my sin is of such a character that none but God can take it away; and even if it were right for me to go and make the confession to my fellow creature, yet I should think it must be utterly unavailing in my case, for my disease is of such a nature, that none but an Almighty Physician ever can remove it.” So he directs his confession and his prayer to one place, and to one alone-“God be merciful to me a sinner.” And you will note in this confession to God, that it was secret: all that you can hear of his confession is just that one word-“a sinner.” Do you suppose that was all he confessed? No, beloved, I believe that long before this, the publican had made a confession of all his sins privately, upon his knees in his own house before God. But now, in God’s house, all he has to say for man to hear, is-“I am a sinner.” And I counsel you, If ever you make a confession before man, let it be a general one but never a particular one. You ought to confess often to your fellow creatures, that you have been a sinner, but to tell to any man in what respect you have been a sinner, is but to sin over again, and to help your fellow creature to transgress. How filthy must be the soul of that priest who makes his ear a common sewer for the filth of other men’s hearts. I cannot imagine even the devil to be more depraved, than the man who spends his time in sitting with his ear against the lips of men and women, who, if they do truly confess, must make him an adept in every vice, and school him in iniquities that he otherwise never could have known. Oh, I charge you never pollute your fellow creature; keep your sin to yourself, and to your God. He cannot be polluted by your iniquity; make a plain and full confession of it before him; but to your fellow creature, add nothing to the general confession-“I am a sinner!” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0216.cfm