“Kant has rightly observed that by the resolution of the concept of a thing we can find neither that it exists nor that it is the cause of something else, and accordingly that the concepts of being and causality are not analytical but can be derived only from experience. When however he later feels himself obliged to assume that the notion of causality originates in a pre-experiential property of the cognising subject and therefore stamps it a mere rule of time-series, by which, in experience, with each observation as cause any other could be connected as effect, then is the child thrown out with the bath. (Indeed, we must derive the relations of causality from experience; but we must not fail to correct and to complete our conception of these facts of experience by reflection.)”

— Bernhard Riemann

Causality, p. 214
Gesammelte Mathematische Werke (1876)

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Bernhard Riemann 43

German mathematician 1826–1866

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“Kant has rightly observed that by the resolution of the concept of a thing we can find neither that it exists nor that it is the cause of something else, and accordingly that the concepts of being and causality are not analytical but can be derived only from experience. When however he later feels himself obliged to assume that the notion of causality originates in a pre-experiential property of the cognising subject and therefore stamps it a mere rule of time-series, by which, in experience, with each observation as cause any other could be connected as effect, then is the child thrown out with the bath.”

Bernhard Riemann (1826–1866) German mathematician

Indeed, we must derive the relations of causality from experience; but we must not fail to correct and to complete our conception of these facts of experience by reflection.
Causality
Gesammelte Mathematische Werke (1876)

“Causality applies only to a system which is left undisturbed. If a system is small, we cannot observe it without producing a serious disturbance and hence we cannot expect to find any causal connexion between the results of our observations. Causality will still be assumed to apply to undisturbed systems and the equations which will be set up to describe an undisturbed system will be differential equations expressing a causal connexion between conditions at one time and conditions at a later time. These equations will be in close correspondence with the equations of classical mechanics, but they will be connected only indirectly with the results of observations.”

Paul Dirac book Principles of Quantum Mechanics

I. The Principle of Superposition - 1. The Need for a Quantum Theory
The Principles of Quantum Mechanics (4th ed. 1958)

“If we wish to express our ideas in terms of the concepts synthetic and analytic, we would have to point out that these concepts are applicable only to sentences that can be either true of false, and not to definitions. The mathematical axioms are therefore neither synthetic nor analytic, but definitions. …Hence the question of whether axioms are a priori becomes pointless since they are arbitrary.”

Hans Reichenbach (1891–1953) American philosopher

The Philosophy of Space and Time (1928, tr. 1957)

“Natural science is the attempt to comprehend nature by precise concepts.
According to the concepts by which we comprehend nature not only are observations completed at every instant but also future observations are pre-determined as necessary, or, in so far as the concept-system is not quite adequate therefor, they are predetermined as probable; these concepts determine what is "possible" (accordingly also what is "necessary," or the opposite of which is impossible), and the degree of the possibility (the "probability") of every separate event that is possible according to them, can be mathematically determined, if the event is sufficiently precise.
If what is necessary or probable according to these concepts occurs, then the latter are thereby confirmed and upon this confirmation by experience rests our confidence in them. If, however, something happens which according to them is not expected and which is therefore according to them impossible or improbable, then arises the problem so to complete them, or if necessary, to transform them, that according to the completed or ameliorated concept-system, what is observed ceases to be impossible or improbable. The completion or amelioration of the concept-system forms the "explanation" of the unexpected observation. By this process our comprehension of nature becomes gradually always more complete and assured, but at the same time recedes even farther behind the surface of phenomena.”

Bernhard Riemann (1826–1866) German mathematician

Theory of Knowledge
Gesammelte Mathematische Werke (1876)

“God is not, as in scholasticism, the final subject of all predicates. He is being as unpredicable. The existence of the creature, in so far as it exists, is the existence of God, and the creature’s experience of God is therefore in the final analysis equally unpredicable. Neither can even be described; both can only be indicated. We can only point at reality, our own or God’s.”

Kenneth Rexroth (1905–1982) American poet, writer, anarchist, academic and conscientious objector

"Eckhart, Brethren of the Free Spirit," from Communalism: From Its Origins to the Twentieth Century (1974), ch. 4
Context: The influence of Meister Eckhart is stronger today than it has been in hundreds of years. Eckhart met the problems of contingency and omnipotence, creator-and-creature-from-nothing by making God the only reality and the presence or imprint of God upon nothing, the source of reality in the creature. Reality in other words was a hierarchically structured participation of the creature in the creator. From the point of view of the creature this process could be reversed. If creatureliness is real, God becomes the Divine Nothing. God is not, as in scholasticism, the final subject of all predicates. He is being as unpredicable. The existence of the creature, in so far as it exists, is the existence of God, and the creature’s experience of God is therefore in the final analysis equally unpredicable. Neither can even be described; both can only be indicated. We can only point at reality, our own or God’s. The soul comes to the realization of God by knowledge, not as in the older Christian mysticism by love. Love is the garment of knowledge. The soul first trains itself by systematic unknowing until at last it confronts the only reality, the only knowledge, God manifest in itself. The soul can say nothing about this experience in the sense of defining it. It can only reveal it to others.