הָֽיְתָה־לִּ֬י דִמְעָתִ֣י לֶ֭חֶם יוֹמָ֣ם וָלָ֑יְלָה בֶּאֱמֹ֥ר אֵלַ֥י כָּל־הַ֝יּ֗וֹם אַיֵּ֥ה אֱלֹהֶֽיךָ׃
My tears have been my food day and night, while they say unto me all the day: 'Where is Thy God?'
Read kabbalistic (mystical) interpretation of Psalms 42:4: and classical mystical sources.