Full Idea
The self-consciousness of modern philosophy is only a being ideated and mediated through abstraction and thus a doubtful being; certain and immediately assured is only that which is an object of the senses, perception and feeling.
Clarification
An 'ideated' thing consists only of ideas; 'mediated through' means 'by means of'
Gist of Idea
Modern self-consciousness is a doubtful abstraction; only senses and feelings are certain
Source
comment on René Descartes (Meditations [1641], 2) by Ludwig Feuerbach - Principles of Philosophy of the Future §37
Book Reference
Feuerbach,Ludwig: 'Principles of the Philosophy of the Future', ed/tr. Vogel,M [Hackett 1986], p.55
A Reaction
This seems to agree with Hume's empirical doubts about the self (Idea 1316). The comment that 'abstraction' is involved in the Cogito argument is interesting. Descartes said the Cogito was a 'simply intuition of the mind' (Idea 3622).
Related Ideas
Idea 1316 Introspection always discovers perceptions, and never a Self without perceptions [Hume]
Idea 3622 The Cogito is not a syllogism but a self-evident intuition [Descartes]