“All true metaphysics is taken from the essential nature of the thinking faculty itself, and therefore in nowise invented, since it is not borrowed from experience, but contains the pure operations of thought, that is, conceptions and principles à priori, which the manifold of empirical presentations first of all brings into legitimate connection, by which it can become empirical knowledge, i. e. experience. …mathematical physicists were thus quite unable to dispense with such metaphysical principles…”
Preface, Tr. Bax (1883)
Metaphysical Foundations of Natural Science (1786)
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Immanuel Kant 200
German philosopher 1724–1804Related quotes

Quote from 'Grundbegriffe der neuen Gestaltenden Kunst', essay by Van Doesburg (published between 1921-23 in De Stijl) - last Chapter; as quoted in 'Fifty Years of Accomplishment, From Kandinsky to Jackson Pollock', by Michel Seuphor, Dell Publishing Co. 1964, p. 86
1920 – 1926

Source: Evolution: the general theory (1996), p. 21 as cited in: Kingsley L. Dennis (2003) An evolutionary paradigm of social systems : An Application of Ervin Laszlo's General. Evolutionary Systems Theory to the Internet http://quigley.mab.ms/wp-content/uploads/2012/01/An-Evolutionary-Paradigm-of-Social-Systems-MA-Thesis.pdf.

Preface, Tr. Bax (1883) citing Isaac Newton's Principia
(1786)
Hayek's Journey: The Mind of Friedrich Hayek (2003)

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Limits of Evolution, p.17-8