Full Idea
Since Plato all philosophers have followed moral 'instinct', or 'faith', or (as I call it) 'the herd'. One might exclude Descartes, the father of rationalism, who recognised only reason - but reason is only an instrument, and Descartes was superficial.
Gist of Idea
Since Plato all philosophers have followed the herd, except Descartes, stuck in superficial reason
Source
comment on René Descartes (Meditations [1641]) by Friedrich Nietzsche - Beyond Good and Evil §191
Book Reference
Nietzsche,Friedrich: 'Beyond Good and Evil', ed/tr. Hollingdale,R.J. [Penguin 1973], p.96