Man has always thought in some way in fact, man has thought the profoundest thoughts, and entrusted them to memory. By thinking in that way he did and does remain related to what must be thought. And yet man is not capable of really thinking as long as that which must be thought about, withdraws. If we, as we are here and now, will not be taken in by empty talk, we must retort that everything said so far is an unbroken chain of hollow assertions, and state besides that what has been presented here has nothing to do with scientific knowledge.
It will be well to maintain as long as possible such a defensive attitude toward what has been said : only in that attitude do we keep the distance needed for a quick running dash by which one or the other of us may succeed in making the leap into thinking. For it is true that what was said so far, and the entire discussion that is to follow, have nothing to do with scientific knowledge, especially not if the discussion itself is to be a thinking. This situation is grounded in the fact that science itself does not think, and cannot think which is its good fortune, here meaning the assurance of its own appointed course. Science does not think. This is a shocking statement. Let the statement be shocking, even though we immediately add the supplementary statement that nonetheless science always and in its own fashion has to do with thinking. That fashion? however, is genuine and consequently fruitful only after the gulf has become visible that lies between thinking and the sciences, lies there unbridgeably.
There is no bridge here only the leap. Hence there is nothing but mischief in all the makeshift ties and asses bridges by which men today would set up a comfortable commerce between thinking and the sciences. Hence we, those of us who come from the sciences, must endure what is shocking and strange about thinking assuming we are ready to learn thinking. To learn means to make everything we do answer to whatever essentials address themselves to us at the given moment. In order to be capable of doing so, we must get underway. It is important above all that on the way on which we set out when we learn to think, we do not deceive ourselves and rashly bypass the pressing questions on the contrary, we must allow ourselves to become involved in questions that seek what no inventiveness can find. Especially we moderns can learn only if we always unlearn at the same time. Applied to the matter before us : we can learn thinking only if we radically unlearn what thinking has been traditionally. To do that, we must at the same time come to know it.
We said : man still does not think, and this because what must be thought about turns away from him; by no means only because man does not sufficiently reach out and turn to what is to be thought.
What must be thought about, turns away from man. It withdraws from him. But how can we have the least knowledge of something that withdraws from the beginning, how can we even give it a name?
Whatever withdraws, refuses arrival. But withdrawing is not nothing. Withdrawal is an event. In fact, what withdraws may even concern and claim man more essentially than anything present that strikes and touches him. Being struck by actuality is what we like to regard as constitutive of the actuality of the actual. However, in being struck by what is actual, man may be debarred precisely from what concerns and touches him touches him in the surely mysterious way of escaping him by its withdrawal. The event of withdrawal could be what is most present in all our present, and so infinitely exceed the actuality of everything actual.