שְׁגִיא֥וֹת מִֽי־יָבִ֑ין מִֽנִּסְתָּר֥וֹת נַקֵּֽנִי׃
誰能察覺自己的錯失呢？求你使我脫離隱而未察的過犯，潔淨無罪。
Rashi
Who understands errors? I was careful with them but it is impossible to be so careful that one does not err in them, and You cleanse me of hidden sins, which were hidden from me; of which I was unaware when I sinned inadvertently.
Radak
Who can discern his errors? Clear Thou me from hidden faults. – It is true that my heart and will are directed towards Thy commandments, but this I ask of Thee, that Thou clear me from hidden faults, for his errors who can discern? for there is no one who knows and discerns all, for somewhere or other he errs and the matter is hidden from his eyes; and for this I make request, that Thou punish me not for my hidden faults, but that Thou clear me from them.