The refuge for the creation, its shelter, its fortress
“There is nothing that removes the afflictions of this world except at-Tawhīd.
That is why the supplication of the distressed person is with Tawhīd: the supplication of Yūnus [عليه السلام]; the distressed person does not supplicate by what Yūnus [عليه السلام] supplicated with except that Allāh releases him from his hardship due to Tawhīd.
There is nothing more gruesome for the distressed person than Shirk [i.e. associating false deities with Allāh / Polytheism], and there is nothing that can rescue you from it except Tawhīd; it is the refuge for the creation, its shelter, its fortress, its aid.”
— Shaykhul-Islām ibnul-Qayyim [رحمه الله] Al-Fawaa’id [p.96]