“A world of such individual minds is by the final implications of this proof the world of primary causes, and every member of it, secure above the vicissitudes of Time and Space and Force, is possessed of a supertemporal or eternal reality, and is therefore not liable to any lethal influence from any other source. Itself a primary cause, it can neither destroy another primary cause nor be destroyed by any. The objector who would open the eternal permanence of the soul to doubt, then, must assail the proofs of a priori knowledge; for so long as these remain free from suspicion, there can be no real question as to what they finally imply. The concomitance of our two streams of experience, the timed stream and the spaced stream, raised from a merely historical into a necessary concomitance by the argument that refers it to the active unity of each soul as its ground, becomes the steadfast sign and visible pledge of the imperishable self-resource of the individual spirit.”

Commentarius in Posteriorum Analyticorum Libros (c. 1217-1220)

1960s, Freedom From The Known (1969)
Context: The world accepts and follows the traditional approach. The primary cause of disorder in ourselves is the seeking of reality promised by another; we mechanically follow somebody who will assure us a comfortable spiritual life. It is a most extraordinary thing that although most of us are opposed to political tyranny and dictatorship, we inwardly accept the authority, the tyranny, of another to twist our minds and our way of life. So if we completely reject, not intellectually but actually, all so-called spiritual authority, all ceremonies, rituals and dogmas, it means that we stand alone and are already in conflict with society; we cease to be respectable human beings. A respectable human being cannot possibly come near to that infinite, immeasurable, reality.

Source: The Secret

Source: Seth, Dreams & Projections of Consciousness, (1986), p. 94, quoting from Seth Session 15

Source: Definition of System, 1956, p. 20 cited in: Baleshwar Thaku eds. (2003) Perspectives in resource management in developing countries. p. 54

Variant: The primary cause of unhappiness is never the situation, but you thoughts about it. Be aware of the thoughts you are thinking.
Source: A New Earth: Awakening to Your Life's Purpose

Concluí, como se conclui sempre em Filosofia, que me encontrava diante duma Causa Primaria, portanto impenetrável.
"José Matias" (1897), collected in Contos (1902); translation by Luís Marques from The Yellow Sofa & Three Portraits (1993) p. 152.

Introduction, pp. 1–2
Books, The Enemy At Home: The Cultural Left And its Responsibility for 9, 11 (2007)

Column, March 21, 2014, " Paul Ryan was right – poverty is a cultural problem" http://www.washingtonpost.com/opinions/george-f-will-the-lefts-half-century-of-denial-over-poverty/2014/03/21/1aeaff4e-b049-11e3-a49e-76adc9210f19_story.html at washingtonpost.com.
2010s