understand. discern.
his. Not in Hebrew text.
errors. wanderings. Like those of the "planets" (= wanderers).
Cleanse. clear, or acquit. Hebrew. nakah.
secret. hidden things; things that are not discerned.
Related Commentaries of Psalms 19:12
Psalms 19:12
12 Who can understand his errors? cleanse thou me from secret faults.