Full Idea
There are schematic minds, those who hold a thought-complex to be truer if it can be sketched into previously drafted schemata or categorical tables. There are countless self-deceptions in this area: nearly all the great 'systems' belong here.
Gist of Idea
Schematic minds think thoughts are truer if they slot into a scheme
Source
Friedrich Nietzsche (Unpublished Notebooks 1885-86 [1886], 40[09])
Book Reference
Nietzsche,Friedrich: 'Fragments from 1885-86 (v 16)', ed/tr. Del Caro,Adrian [Stanford 2020], p.187
A Reaction
Why 'nearly all'? Aristotle might be a candidate for such a person. Leibniz, perhaps. Nietzsche identified with Becoming and Heraclitus, as opposed to Being and Parmenides.