Musar su Salmi 25:7

And our Rabbis, may their memory be blessed, said (Yoma 86b, though our version of the Talmud has the opinions inverted), “Transgressions that one confessed on this Yom Kippur, he should repeat and confess on another Yom Kippur, as it is stated (Psalms 51:5), ‘and my sin is ever before me.’ Rabbi Eliezer ben Ya’akov says, ‘He should not confess them on another Yom Kippur.’” But in the Midrash (Midrash Tehillim 32; Shemot Rabbah 53:2), they warned a great deal not to repeat and confess them on another Yom Kippur. And they warned about this from (two) [three] angles: The first is that he shows himself to be from those with little trust and as if he does not trust the greatness of God’s forgiveness, may He be blessed - that He lifts off the iniquity and passes over the transgression. And they mentioned about this, “Let lying lips be stilled” (Psalms 31:19). And the second is because if he only mentions the earlier iniquities, he will appear like one whose only worry is about the earlier ones. And has he not sinned afterwards? And if so, he appears as one who does not search and examine his ways; and this is a very bad sickness. For those that supervise their souls always see matters of iniquity in it or its ailments; or that it is falling short in attaining levels of fear [of God]; or that it is falling short in [divine] service and involvement in Torah [study] - as there are great punishments for these. And also since transgressions of the tongue are common. And our Rabbis, may their memory be blessed, said (Bava Batra 164b), “[There are] three things from which a person is not spared each day: Sinful thoughts, the dust of evil speech and [that they are not focusing their hearts] in prayer [many times].” And the third is because it appears as if he is boasting through his confession [that is] only upon the earlier ones, as he did not sin afterwards. And in the Midrash, they said, “Is it because you do not have from the new, that you are confessing about the earlier ones?” And they explained in the Midrash that, that which it is written “and my sin is ever before me,” is [to mean] that they should be in front of his eyes and remembered in his heart, but not that he should mention them with his mouth. They also explained in the Talmud Yerushalmi Yoma 8:7 that they should not be in your eyes as if you did not do them; but rather as if you did them and they were forgiven. And we have already mentioned this in the Gates of the Fundamentals of Repentance (1:48). Nevertheless, he should seek mercy all the days of his life for forgiveness of his iniquities, both old and new; and be afraid and scared [that] maybe he has not completed the measure of the fundamentals of repentance. Secondly - because the sins that [warrant] excision are absolved by afflictions, as we mentioned. King David, peace be upon him, also said (Psalms 25:7), “Do not remember my youthful sins and transgressions.” However he did not mention the earlier ones individually, since he already repented for them and confessed them on Yom Kippur. So he already fulfilled the commandment of confession and can trust that his confession was already accepted for that which confession is fitting to atone. However he should pray for the forgiveness of his iniquities all of his days, as we mentioned. Yet it is not from the obligation of prayer to specify his sins; only from the obligation of confession. And there is yet another reason to pray about the iniquities of earlier days - because maybe he has iniquities and sins that he did not contemplate; and did not remember and confess, like the matter that is stated (Psalms 19:13), “Clear me of unperceived guilt.”