According to him, the Ego posits first itself (thesis); secondly, the non-Ego, the other, opposite to itself (antithesis); and, thirdly, this non-Ego within itself (synthesis), so that all reality is in consciousness.
Hence it is the office of the theory of knowledge to show that the Ego posits the thing per se as only existing for itself, a noumenon in the sense of a product of its own thinking.
Further, according to Fichte, on the one hand the Ego posits itself as determined through the non-Ego - no object, no subject; this is the principal fact about theoretical reason; on the other hand, the Ego posits itself as determining the non-Ego - no subject, no object; this is the principal fact about practical reason.
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