The representation of the self-sufficiency of the I can certainly co-exist with a representation of the self-sufficiency of the thing, though the self-sufficiency of the I itself cannot co-exist with that of the thing. Only one of these two can come first, only one can be the starting point; only one can be independent. The one that comes second, just because it comes second, necessarily becomes dependent upon the one that comes first, with which it is supposed to be connected. Which of these two should come first?

p. 17-18. - Introduction to Fichte's Science of Knowledge (1797)