Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from "Tales of Power" (Chapter 10)
“Man is the only living species that has the power to act as his own destroyer—and that is the way he has acted through most of his history.”
The Virtue of Selfishness (1964)
Source: The Virtue of Selfishness: A New Concept of Egoism
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Ayn Rand 322
Russian-American novelist and philosopher 1905–1982Related quotes

“Most powerful is he who has himself in his own power.”
Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from A Separate Reality (Chapter 6)

Reflections on the Revolution in France (1790)
Context: Where popular authority is absolute and unrestrained, the people have an infinitely greater, because a far better founded, confidence in their own power. They are themselves, in a great measure, their own instruments. They are nearer to their objects. Besides, they are less under responsibility to one of the greatest controlling powers on the earth, the sense of fame and estimation. The share of infamy that is likely to fall to the lot of each individual in public acts is small indeed; the operation of opinion being in the inverse ratio to the number of those who abuse power. Their own approbation of their own acts has to them the appearance of a public judgment in their favor. A perfect democracy is, therefore, the most shameless thing in the world. As it is the most shameless, it is also the most fearless. No man apprehends in his person that he can be made subject to punishment.
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 608.

To Jerusalem and Back: A Personal Account (1976), p. 38
General sources
Source: The Frontiers of Meaning: Three Informal Lectures on Music (1994), Ch. 1 : The Frontiers of Nonsense
Source: Carlos Castaneda (1971) Separate Reality: Conversations With Don Juan. p. 85; As cited in: Eugene Dupuis (2001) Time Shift: Managing Time to Create a Life You Love. Ch. 5: Self Management