Beyond Good and Evil by Friedrich Nietzsche Chapter 2 Page 27

position, the ERRONEOUSNESS of the world in which we think we live is the surest and most certain thing our eyes can light upon: we find proof after proof thereof, which would fain allure us into surmises concerning a deceptive principle in the “nature of things.” He, however, who makes thinking itself, and consequently “the spirit,” responsible for the falseness of the world — an honourable exit, which every conscious or unconscious advocatus dei avails himself of — he who regards this world, including space, time, form, and movement, as falsely DEDUCED, would have at least good reason in the end to become distrustful also of all thinking; has it not hitherto been playing upon us the worst of scurvy tricks?

and what guarantee would it give that it would not continue to do what it has