“Not how the world is, but that it is, is the mystery.”
Variant translation: The mystical is not how the world is, but that it is.
Original German: Nicht wie die Welt ist, ist das Mystische, sondern dass sie ist.
1920s, Tractatus Logico-Philosophicus (1922)
Variant: The mystical is not how the world is, but that it is.
Context: It is not how things are in the world that is mystical, but that it exists. (6.44)