Lamentations 3:2 Kabbalah

אוֹתִ֥י נָהַ֛ג וַיֹּלַ֖ךְ חֹ֥שֶׁךְ וְלֹא־אֽוֹר׃

He hath led me and caused me to walk in darkness and not in light.

Read kabbalistic (mystical) interpretation of Lamentations 3:2: and classical mystical sources.