All calculation lets what is countable be resolved into something counted that can then be used for subsequent counting. Calculation refuses to let anything appear except what is countable. Everything is only whatever it counts. What has been counted in each instance secures the continuation of counting. Such counting progressively consumes numbers, and is itself a continual self-consumption. The calculative process of resolving beings into what has been counted counts as the explanation of their being. Calculation uses all beings in advance as that which is countable, and uses up what is counted for the purpose of counting. This use of beings that consumes them betrays the consuming character of calculation. Only because number can be infinitely multiplied, irrespective of whether this occurs in the direction of the large or the small, can the consuming essence of calculatdon hide behind its products and lend to calculative thinking the semblance of productivity - whereas already in its anticipatory grasping, and not primarily in its subsequent results, such thinking lets all beings count only in the form of what can be set at our disposal and consumed. Calculative thinking compels itself into a compulsion to master everything on the basis of the consequential correctness of its procedure. It is unable to foresee that everything calculable by calculution - prior to the sum-totals and products that it produces by calculation in each case - is already a whole, a whole whose unity indeed belongs to the incalculable that withdraws itself and its uncanniness from the claws of calculation. Yet that which everywhere and always from the outset has closed itself off from the intent behind calculation, and yet, in its enigmatic unfamiliarity, is at all times nearer to the human being than all those beings in which he establishes himself and his intentions, can at times attune the essence of the human being to a thinking whose truth no “logic" is capable of grasping. That thinking whose thoughts not only cannot be calculated, but are in general determined by that which is other than beings, may be called essential thinking. Instead of calculatively counting on beings by means of beings, it expends itself in being for the truth of being. Such thinking responds to the claim of being, through the human being letting his historical essence be responsible to the simplicity of a singular necessity, one that does not necessitate by way of compulsion, but creates the need that fulfills itself in the freedom of sacrifice. The need is for the truth of being to be preserved, whatever may happen to human beings and to all beings. The sacrifice is that of the human essence expending itself- in a manner removed from all compulsion, because it arises from the abyss of freedom - for the preservation of the truth of being for beings. In sacrifice there occurs [ereignet sich] the concealed thanks that alone pays homage to the grace that being has bestowed upon the human essence in thinking, so that human beings may, in their relation to being, assume the guardianship of being. Originary thinking [Das anfängliche Denken] is the echo of being’s favor, of a favor in which a singulur event is cleared and lets come to pass [sich ereignen]: that beings are. This echo is the human response to the word of the silent voice of being. The response of thinking is the origin of the human word, which word first lets language arise as the sounding of the word into words. Were there not at times a concealed thinking in the ground of the essence of historical human beings, then human beings would never be capable of thanking — granted that in all thinking of something and in every thanking there must indeed be a thinking that thinks the truth of being in an originary manner. Yet how else would a particular humankind ever find its way into an originary thanking unless the favor of being, through an open relation to such favor, granted human beings the nobility of a poverty in which the freedom of sacrifice conceals the treasure of its essence? Sacrifice is the departure from beings on the path to preserving the favor of being. Sacrifice can indeed be prepared and served by working and achievement with respect to beings, yet never fulfillled by such activities. Its accomplishment stems from that inherent stance [Ibständigkeit] out of which every historical human being through action - and essential lhinking is an action - preserves the Dasein he has attained for the preservation of the dignity of being. Such a stance is the equanimity that allows nothing to assail its concealed readiness for the essential departure that belongs to every sacrifice. Sacrifice is at home in the essence of the event [Ereignis] whereby being lays claim upon the human being for the truth of being. For this reason, sacrifice tolerates no calculation, which can only ever miscalculate it in terms of utility or uselessness, whether the ends are placed low or set high. Such miscalculation distorts the essence of sacrifice. The obsession with ends confuses the clarity of the awe, ready for anxiety, that belongs to the courage of sacrifice which has taken upon itself the neighborhood of the indestructible.
P. 235-237