Ramanujacharya's Brahma Sutra Bhashya translated By George Thibaut
SriBhashya - Ramanuja's Commentary On Brahma Sutra (Vedanta Sutra)

Pratyaksha--even of the nirvikalpaka kind--proves difference.

Perception in the next place--with its two subdivisions of non-determinate (nirvikalpaka) and determinate (savikalpaka) perception--also cannot be a means of knowledge for things devoid of difference. Determinate perception clearly has for its object things affected with difference; for it relates to that which is distinguished by generic difference and so on. But also non-determinate perception has for its object only what is marked with difference; for it is on the basis of non-determinate perception that the object distinguished by generic character and so on is recognised in the act of determinate perception. Non-determinate perception is the apprehension of the object in so far as destitute of some differences but not of all difference. Apprehension of the latter kind is in the first place not observed ever to take place, and is in the second place impossible: for all apprehension by consciousness takes place by means of some distinction 'This is such and such.' Nothing can be apprehended apart from some special feature of make or structure, as e.g. the triangularly shaped dewlap in the case of cows. The true distinction between non-determinate and determinate perception is that the former is the apprehension of the first individual among a number of things belonging to the same class, while the latter is the apprehension of the second, third, and so on, individuals. On the apprehension of the first individual cow the perceiving person is not conscious of the fact that the special shape which constitutes the generic character of the class 'cows' extends to the present individual also; while this special consciousness arises in the case of the perception of the second and third cow. The perception of the second individual thus is 'determinate' in so far as it is determined by a special attribute, viz. the extension, to the perception, of the generic character of a class--manifested in a certain

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outward shape--which connects this act of perception with the earlier perception (of the first individual); such determination being ascertained only on the apprehension of the second individual. Such extension or continuance of a certain generic character is, on the other hand, not apprehended on the apprehension of the first individual, and perception of the latter kind thence is 'non-determinate.' That it is such is not due to non-apprehension of structure, colour, generic character and so on, for all these attributes are equally objects of sensuous perception (and hence perceived as belonging to the first individual also). Moreover that which possesses structure cannot be perceived apart from the structure, and hence in the case of the apprehension of the first individual there is already perception of structure, giving rise to the judgment 'The thing is such and such.' In the case of the second, third, &c., individuals, on the other hand, we apprehend, in addition to the thing possessing structure and to the structure itself, the special attribute of the persistence of the generic character, and hence the perception is 'determinate.' From all this it follows that perception never has for its object that which is devoid of all difference.