Full Idea
The intellect cannot critically examine itself precisely because it cannot be compared with other intellects of dissimilar natures.
Gist of Idea
Intellects cannot critically self-examine, because no comparisons can be made
Source
Friedrich Nietzsche (Fragments from 1886-87 (v 17) [1887], 5[011])
A Reaction
There is obviously an assumption that understanding always needs comparisons. This entails that nothing unique can ever be understood, which seems dubious. An interesting thought, though. Try applying it to yourself.
Book Reference
Nietzsche,Friedrich: 'Fragments from 1886-87 (v 17)', ed/tr. Leiner, George H. [Stanford 2025], p.6