Human existence can relate to beings only if it holds itself out into the nothing. Going beyond beings occurs in the essence of Dasein. But this going beyond is metaphysics itself. This implies that metaphysics belongs to the nature of man. It is neither a division of academic philosophy nor a field of arbitrary notions. Metaphysics is the basic occurrence of Dasein. It is Dasein itself. Because the truth of metaphysics dwells in this groundless ground it stands in closest proximity to the constantly lurking possibility of deepest error. For this reason no amount of scientific rigor attains to the seriousness of metaphysics. Philosophy can never be measured by the standard of the idea of science.If the question of the nothing unfolded here has actually questioned us, then we have not simply brought metaphysics before us in an extrinsic manner. Nor have we merely been transposed to it. We cannot be transposed there at all, because insofar as we exist we are always there already. For by nature, my friend, man's mind dwells in philosophy (Plato, Phaedrus, 279a). So long as man exists, philosophizing of some sort occurs. Philosophy―what we call philosophy―is metaphysics getting under way, in which philosophy comes to itself and to its explicit tasks. Philosophy gets under way only by a peculiar insertion of our own existence into the fundamental possibilities of Dasein as a whole. For this insertion it is of decisive importance, first, that we allow space for beings as a whole; second, that we release ourselves into the nothing, which is to say, that we liberate ourselves from those idols everyone has and to which he is wont to go cringing; and finally, that we let the sweep of our suspense take its full course, so that it swings back into the basic question of metaphysics which the nothing itself compels: 'Why are there beings at all, and why not rather nothing?'―from_What is Metaphysics?_

~ Martin Heidegger

Our critique is not opposed to the *dogmatic procedure* of reason in its pure knowledge as science (for science must always be dogmatic, that is, derive its proof from secure *a priori* principles), but only to *dogmatism*, that is, to the presumption that it is possible to make any progress with pure (philosophical) knowledge from concepts according to principles, such as reason has long been in the habit of using, without first inquiring in what way, and by what right, it has come to posses them. Dogmatism is therefore the dogmatic procedure of pure reason, *without a preceding critique of its own powers*; and our opposition to this is not intended to defend that loquacious shallowness which arrogates to itself the name of popularity, much less that skepticism which makes short work of the whole of metaphysics. On the contrary, our critique is meant to form a necessary preparation in support of metaphysics as a thorough science, which must necessarily be carried out dogmatically and strictly systematically, so as to satisfy all the demands, no so much of the public at large, as of the Schools. This is an indispensable demand for it has undertaken to carry out its work entirely *a priori*, and thus to carry it out to the complete satisfaction of speculative reason. In the execution of this plan, as traced out by the critique, that is, in a future system of metaphysics, we shall have to follow the strict method of the celebrated Wolff, the greatest of all dogmatic philosophers. He was the first to give an example (and by his example initiated, in Germany, that spirit of thoroughness which is not yet extinct) of how the secure course of a science could be attained only through the lawful establishment of principles, the clear determination of concepts, the attempt at strictness of proof and avoidance of taking bold leaps in our inferences. He was therefore most eminently qualified to give metaphysics the dignity of a science, if it had only occurred to him to prepare his field in advance by criticism of the organ, that is, of pure reason itself―an omission due not so much to himself as to the dogmatic mentality of his age, about which the philosophers of his own, as well as of all previous times, have no right to reproach one another. Those who reject both the method of Wolff and the procedure of the critique of pure reason can have no other aim but to shake off the fetters of *science* altogether, and thus to change work into play, certainty into opinion and philosophy into philodoxy. ―from_Critique of Pure Reason_. Preface to the Second Edition. Translated, edited, and with an Introduction by Marcus Weigelt, based on the translation by Max Müller, pp. 28-29

~ Immanuel Kant

Human existence can relate to beings only if it holds itself out into the nothing. Going beyond beings occurs in the essence of Dasein. But this going beyond is metaphysics itself. This implies that metaphysics belongs to the nature of man. It is neither a division of academic philosophy nor a field of arbitrary notions. Metaphysics is the basic occurrence of Dasein. It is Dasein itself. Because the truth of metaphysics dwells in this groundless ground it stands in closest proximity to the constantly lurking possibility of deepest error. For this reason no amount of scientific rigor attains to the seriousness of metaphysics. Philosophy can never be measured by the standard of the idea of science.If the question of the nothing unfolded here has actually questioned us, then we have not simply brought metaphysics before us in an extrinsic manner. Nor have we merely been transposed to it. We cannot be transposed there at all, because insofar as we exist we are always there already. For by nature, my friend, man's mind dwells in philosophy (Plato, Phaedrus, 279a). So long as man exists, philosophizing of some sort occurs. Philosophy―what we call philosophy―is metaphysics getting under way, in which philosophy comes to itself and to its explicit tasks. Philosophy gets under way only by a peculiar insertion of our own existence into the fundamental possibilities of Dasein as a whole. For this insertion it is of decisive importance, first, that we allow space for beings as a whole; second, that we release ourselves into the nothing, which is to say, that we liberate ourselves from those idols everyone has and to which he is wont to go cringing; and finally, that we let the sweep of our suspense take its full course, so that it swings back into the basic question of metaphysics which the nothing itself compels: 'Why are there beings at all, and why not rather nothing?―from_What is Metaphysics?_

~ Martin Heidegger

I now turn to a *subjective* consideration that belongs here; yet I can give even less distinctness to it than to the objective consideration just discussed, for I shall be able to express it only by image and simile. Why is our consciousness brighter and more distinct the farther it reaches outwards, so that its greatest clearness lies in sense perception, which already half belongs to things outside us; and, on the other hand, becomes more obscure as we go inwards, and leads, when followed to its innermost recesses, into a darkness in which all knowledge ceases? Because, I say, consciousness presupposes *individuality*; but this belongs to the mere phenomenon, since, as the plurality of the homogeneous, it is conditioned by the forms of the phenomenon, time and space. On the other hand, our inner nature has its root in what is no longer phenomenon but thing-in-itself, to which therefore the forms of the phenomenon do not reach; and in this way, the chief conditions of individuality are wanting, and distinct consciousness ceases therewith. In this root-point of existence the difference of beings ceases, just as that of the radii of a sphere ceases at the centre. As in the sphere the surface is produced by the radii ending and breaking off, so consciousness is possible only where the true inner being runs out into the phenomenon. Through the forms of the phenomenon separate individuality becomes possible, and on this individuality rests consciousness, which is on this account confined to phenomena. Therefore everything distinct and really intelligible in our consciousness always lies only outwards on this surface on the sphere. But as soon as we withdraw entirely from this, consciousness forsakes us―in sleep, in death, and to a certain extent also in magnetic or magic activity; for all these lead through the centre. But just because distinct consciousness, as being conditioned by the surface of the sphere, is not directed towards the centre, it recognizes other individuals certainly as of the same kind, but not as identical, which, however, they are in themselves. Immortality of the individual could be compared to the flying off at a tangent of a point on the surface; but immortality, by virtue of the eternity of the true inner being of the whole phenomenon, is comparable to the return of that point on the radius to the centre, whose mere extension is the surface. The will as thing-in-itself is entire and undivided in every being, just as the centre is an integral part of every radius; whereas the peripheral end of this radius is in the most rapid revolution with the surface that represents time and its content, the other end at the centre where eternity lies, remains in profoundest peace, because the centre is the point whose rising half is no different from the sinking half. Therefore, it is said also in the *Bhagavad-Gita*: *Haud distributum animantibus, et quasi distributum tamen insidens, animantiumque sustentaculum id cognoscendum, edax et rursus genitale* (xiii, 16, trans. Schlegel) [Undivided it dwells in beings, and yet as it were divided; it is to be known as the sustainer, annihilator, and producer of beings]. Here, of course, we fall into mystical and metaphorical language, but it is the only language in which anything can be said about this wholly transcendent theme.―from_The World as Will and Representation_. Translated from the German by E. F. J. Payne. In Two Volumes, Volume II, pp. 325-326

~ Arthur Schopenhauer