Full Idea
Kant asked himself: how are synthetic judgements a priori possible? And what, really, did he answer? By means of a faculty!
Gist of Idea
Kant's only answer as to how synthetic a priori judgements are possible was that we have a 'faculty'!
Source
comment on Immanuel Kant (Critique of Pure Reason [1781]) by Friedrich Nietzsche - Beyond Good and Evil §011
Book Reference
Nietzsche,Friedrich: 'Beyond Good and Evil', ed/tr. Hollingdale,R.J. [Penguin 1973], p.23