“We venture to say a few words in explanation of the plan of this work. Its object is not to force upon the public the personal views or theories of its author; nor has it the pretensions of a scientific work, which aims at creating a revolution in some department of thought. It is rather a brief summary of the religions, philosophies, and universal traditions of human kind, and the exegesis of the same, in the spirit of those secret doctrines, of which none — thanks to prejudice and bigotry — have reached Christendom in so unmutilated a form, as to secure it a fair judgment. Since the days of the unlucky mediaeval philosophers, the last to write upon these secret doctrines of which they were the depositories, few men have dared to brave persecution and prejudice by placing their knowledge upon record. And these few have never, as a rule, written for the public, but only for those of their own and succeeding times who possessed the key to their jargon. The multitude, not understanding them or their doctrines, have been accustomed to regard them en masse as either charlatans or dreamers. Hence the unmerited contempt into which the study of the noblest of sciences — that of the spiritual man — has gradually fallen.”

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Right Relation of Reason to Religion, p.242-3

Space, Time and Gravitation (1920)

Source: The City of God and the True God as its Head (In Royce’s “The Conception of God: a Philosophical Discussion Concerning the Nature of the Divine Idea as a Demonstrable Reality”), p.90-1

Source: The Division of Labor in Society (1893), p. 40

Philosophie ... hat zwar ihre Gegenstände zunächst mit der Religion gemeinschaftlich. Beide haben die Wahrheit zu ihrem Gegenstande, und zwar im höchsten Sinne - in dem, daß Gott die Wahrheit und er allein die Wahrheit ist.
Logic, Chapter 1

Source: The Institutional Approach to Economic Theory, 1919, p. 309: Introduction

from Jorn's 'Notebook', containing the draft for a book on Danish experimental art (1948)
1949 - 1958, Various sources

Christian Mysticism (1899), Preface
Context: The phase of thought or feeling which we call Mysticism has its origin in that which is the raw material of all religion, and perhaps of all philosophy and art as well, namely, that dim consciousness of the beyond, which is part of our nature as human beings. Men have given different names to these "obstinate questionings of sense and outward things." We may call them, if we will, a sort of higher instinct, perhaps an anticipation of the evolutionary process; or an extension of the frontier of consciousness; or, in religious language, the voice of God speaking to us. Mysticism arises when we try to bring this higher consciousness into relation with the other contents of our minds.