Study of Man

"One of the great mistakes of the last period of man's evolution during the last few centuries, has been to identify being with thought as such. Cogito ergo sum (I think therefore I am), is the greatest error that has been put at the summit of recent philosophy, for in the whole range of the Cogito there lies not the sum but the non sum. That is to say, as far as my knowledge reaches I do not exist, but there is only image."

"When I go out into Nature I have the play of light and colour continually before me; in assimilating the light and its colours I am uniting myself with that part of Nature which is being carried on into the future; and when I return to my room and think over what I have seen in Nature, and spin laws about it, then I am concerning myself with that element in the world which is perpetually dying. In Nature dying and becoming are continuously flowing into one another. We are able to comprehend the dying element because we bear within us the reflection of our prenatal life, the world of intellect, the world of thought, whereby we can see in our mind's eye the elements of death at the basis of Nature. And we are able to grasp what will come of Nature in the future because we confront Nature, not only with our intellect and thought, but with that which is of a will-nature within ourselves.
Were it not that, during his earthly life, man could preserve some part of what before his birth became purely thought life, he would never be able to achieve freedom. For, in that case, man would be bound up with what is dead, and the moment he wanted to call into free activity what in himself is related to the dead element in Nature, he would be wanting to call into free activity a dying thing. And if he wished to make use of what unites him with Nature as a being of will, his consciousness would be deadened, for what unites him as a will being with Nature is still in germ. He would be a Nature being, but not a free being.
Over and above these two elements — the comprehension of what is dead through the intellect, and the comprehension of what is living and becoming through the will — there dwells something in man which he alone and no other earthly being bears within him from birth to death, and that is pure thinking; that kind of thinking which is not directed to external nature, but is solely directed to the supersensible nature in man himself, to that which makes him an autonomous being, something over and above what lives in the “less than death” and “more than life.” When speaking of human freedom therefore, one has to pay attention to this autonomous thing in man, this pure sense-free thinking in which the will too is always present..."

Rudolf Steiner, 1919
The Book: Here