Original Quotes - page 14
My immediate consciousness, my absolute perception, cannot go beyond myself, - I have immediate knowledge only of myself, whatever I know further I know only by reasoning, in the same manner in which I have come to those conclusions concerning the original powers of Nature, which certainly do not lie within the circle of my perceptions. I, however, - that which I call myself, - am not the man-forming power of Nature, but only one of its manifestations; and only of this manifestation am I conscious, not of that power, whose existence I have only discovered from the necessity of explaining my own.
Johann Gottlieb Fichte