The Toa of Pooh by Benjamin Hoff - read at a formative time and always recenters me though I am not at all a toaist in any way
The Boy, the Mole, the Fox, and the Horse by Charlie Mackesy - I was gifted this by a beloved for graduation and truly always return to it when I feel lower than nothing.
The Little Prince by Antoine de Saint-Exupéry - little needs to be said, read this often to keep on living.