The most perfect and satisfactory knowledge is that of perception but this is limited to the absolutely particular, to the individual. The comprehension of the many and the various into *one* representation is possible only through the *concept*, in other words, by omitting the differences; consequently, the concept is a very imperfect way of representing things. The particular, of course, can also be apprehended immediately as a universal, namely when it is raised to the (Platonic) *Idea*; but in this process, which I have analysed in the third book, the intellect passes beyond the limits of individuality and therefore of time; moreover, this is only an exception.These inner and essential imperfections of the intellect are further increased by a disturbance to some extent external to it but yet inevitable, namely, the influence that the *will* exerts on all its operations, as soon as that will is in any way concerned in their result. Every passion, in fact every inclination or disinclination, tinges the objects of knowledge with its colour. Most common of occurrence is the falsification of knowledge brought about by desire and hope, since they show us the scarcely possible in dazzling colours as probable and well-nigh certain, and render us almost incapable of comprehending what is opposed to it. Fear acts in a similar way; every preconceived opinion, every partiality, and, as I have said, every interest, every emotion, and every predilection of the will act in an analogous manner.Finally, to all these imperfections of the intellect we must also add the fact that it grows old with the brain; in other words, like all physiological functions, it loses its energy in later years; in this way all its imperfections are then greatly increased.”—from_The World as Will and Representation_. Translated from the German by E. F. J. Payne in two volumes: volume II, pp. 139-141
To clarify the existentiality of the Self, we take as our ‘natural’ point of departure Dasein’s everyday interpretation of the Self. In *saying* “*I*,” Dasein expresses itself about ‘itself’. It is not necessary that in doing so Dasein should make any utterance. With the ‘I’, this entity has itself in view. The content of this expression is regarded as something utterly simple. In each case, it just stands for me and nothing further. Also, this ‘I’, as something simple, is not an attribute of other Things; it is not *itself* a predicate, but the absolute ‘subject’. What is expressed and what is addressed in saying “I,” is always met as the same persisting something. The characteristics of ‘simplicity’, ‘substantiality’, and ‘personality’, which Kant, for instance, made the basis for his doctrine ‘of the paralogisms of pure reason’, arise from a genuine pre-phenomenological experience. The question remains whether that which we have experienced ontically in this way may be Interpreted ontologically with the help of the ‘categories’ mentioned.Kant, indeed, in strict conformity with the phenomenal content given in saying “I,” shows that the ontical theses about the soul-substance which have been inferred [*erschlossenen*] from these characteristics, are without justification. But in so doing, he merely rejects a wrong *ontical* explanation of the “I”; he has by no means achieved an *ontological* Interpretation of Selfhood, nor has he even obtained some assurance of it and made positive preparation for it. Kant makes a more rigorous attempt than his predecessors to keep hold of the phenomenal content of saying “I”; yet even though in theory he has denied that the ontical foundations of the ontology of the substantial apply to the “I,” he still slips back into *this same* inappropriate ontology. This will be shown more exactly, in order that we may establish what it means ontologically to take saying “I” as the starting point for the analysis of Selfhood. The Kantian analysis of the ‘I think’ is now to be added as an illustration, but only so far as is demanded for clarifying these problems."―from_Being and Time_. Translated by John Macquarrie & Edward Robinson, p. 366