כִּ֛י גַּם־פְּעָמִ֥ים רַבּ֖וֹת יָדַ֣ע לִבֶּ֑ךָ אֲשֶׁ֥ר גַּם־את [אַתָּ֖ה] קִלַּ֥לְתָּ אֲחֵרִֽים׃
for oftentimes also thine own heart knoweth that thou thyself likewise hast cursed others.
Read midrashic interpretation of Ecclesiastes 7:22: and classical rabbinic exegesis.