דִּבְרֵ֣י עֲ֭וֺנֹת גָּ֣בְרוּ מֶ֑נִּי פְּ֝שָׁעֵ֗ינוּ אַתָּ֥ה תְכַפְּרֵֽם׃
The tale of iniquities is too heavy for me; as for our transgressions, Thou wilt pardon them.
Read kabbalistic (mystical) interpretation of Psalms 65:4: and classical mystical sources.