The I posits itself, and exists only by virtue of this self-positing.
Das Ich setzt sich selbst, und es ist, vermöge dieses bloßen Setzens durch sich selbst.

Philosophers
Johann Gottlieb Fichte
Founder of German Idealism (1762-1814). Dropping Kant's thing-in-itself, Fichte derived experience from the self-positing I in his Wissenschaftslehre. His Addresses to the German Nation are a touchstone of nationalism.
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Source: Grundlage der gesamten Wissenschaftslehre (1794/95), §1Verified