וְאֵין־קוֹרֵ֣א בְשִׁמְךָ֔ מִתְעוֹרֵ֖ר לְהַחֲזִ֣יק בָּ֑ךְ כִּֽי־הִסְתַּ֤רְתָּ פָנֶ֙יךָ֙ מִמֶּ֔נּוּ וַתְּמוּגֵ֖נוּ בְּיַד־עֲוֺנֵֽנוּ׃
And there is none that calleth upon Thy name, that stirreth up himself to take hold of Thee; for Thou hast hid Thy face from us, and hast consumed us by means of our iniquities.
Read halakhic rulings (Jewish law) on Isaiah 64:6: and classical halakhic sources.