Psalms 142:1 Kabbalah

מַשְׂכִּ֥יל לְדָוִ֑ד בִּהְיוֹת֖וֹ בַמְּעָרָ֣ה תְפִלָּֽה׃

Maschil of David, when he was in the cave; a Prayer.

Read kabbalistic (mystical) interpretation of Psalms 142:1: and classical mystical sources.