Purely subjective relationships to feeling are the source of all our knowledge [03.29.98]

‘To be sure, you give the name sweet to what occurs in you when you eat sugar, and he and all your fellows also call it sweet as you do; but this is a merely verbal agreement. For how do you know that what you both call sweet is exactly the same for him as it is for you? There is no settling such a question this side of eternity; the issue lies in the realm of pure subjectivity, and is not objective at all. Only when the sugar is synthesized with a determinate taste, in itself subjective, but objective solely in virtue of its determinacy in general, is the matter transferred to the sphere of objectivity. - Such purely subjective relationships to feeling are the source of all our knowledge; without feeling, there can be no presentation at all of an external thing.’

[J.G. Fichte, The Science of Knowledge. {1868} - 1982. C.U.P.p.275]