Full Idea
We are in the process of figuring out the being of things: consequently we must already have an opinion as to what being is. This can be an error! E.g., I.
Gist of Idea
To think about being we must have an opinion about what it is
Source
Friedrich Nietzsche (Unpublished Notebooks 1882-84 [1883], 9[41])
Book Reference
Nietzsche,Friedrich: 'Fragments from the period of 'Zarathustra' (v 14)', ed/tr. Loeb/Tinsley [Stanford 2019], p.318
A Reaction
The point of 'I' is that we unquestioningly think the self is a given aspect of being, as in Descartes.