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“I do not know without knowing something. I do not know anything about myself without becoming something for myself through this knowledge – or, which is simply to say the same thing, without separating something subjective in me from something objective. As soon as consciousness is posited, this separation is posited; without the latter no consciousness whatsoever is possible. Through this very separation, however, the relation of what is subjective and what is objective to each other is also immediately posited. What is objective is supposed to subsist through itself, without any help from what is subjective and independently of it. What is subjective is supposed to depend on what is objective and to receive its material determination from it alone. Being exists on its own, but knowledge depends on being: the two must appear to us in this way, just as surely as anything at all appears to us, as surely as we possess consciousness.

We thereby obtain the following, important insight: knowledge and being are not separated outside of consciousness and independent of it; instead, they are separated only within consciousness, since this separation is a condition for the possibility of all consciousness, and it is only through this separation that the two of them first arise. There is no being except by means of consciousness, just as there is, outside of consciousness, no knowing, as a merely subjective reference to a being. I am required to bring about a separation simply in order to be able to say to myself “I”; and yet it is only by saying “I” and only insofar as I say this that such a separation occurs. The unity [das Eine] that is divided – which thus lies at the basis of all consciousness and due to which what is subjective and what is objective in consciousness are immediately posited as one – is absolute = X, and this can in no way appear within consciousness as something simple.”
― Johann Gottlieb Fichte, Fichte: The System of Ethics