“The measure of action is the sentiment from which it proceeds. The greatest action may easily be one of the most private circumstance.”

Life of Agesilaus II
Bartlett's Familiar Quotations, 10th ed. (1919)

The Common School Journal Vol. IX, No. 12 (15 June 1847), p. 181
Context: Manners easily and rapidly mature into morals. As childhood advances to manhood, the transition from bad manners to bad morals is almost imperceptible. Vulgar and obscene forms of speech keep vulgar and obscene objects before the mind, engender impure images in the imagination, and make unlawful desires prurient. From the prevalent state of the mind, actions proceed, as water rises from a fountain.

An Inquiry into the Original of our Ideas of Beauty and Virtue (1725) Treatise II, Section 3
Context: That Action is best, which procures the greatest Happiness for the greatest Numbers; and that worst, which, in like manner, occasions Misery.

“Goethe; or, the Writer,” pp. 271-272
1850s, Representative Men (1850)

A Voice Crying in the Wilderness (Vox Clamantis in Deserto) (1990)

Pt. III, sec. 2, ch. 24 Lectures on the History of History Vol 1 p. 21 John Sibree translation (1857), 1914
Lectures on the Philosophy of History (1832), Volume 1
Context: Although Freedom is, primarily, an undeveloped idea, the means it uses are external and phenomenal; presenting themselves in History to our sensuous vision. The first glance at History convinces us that the actions of men proceed from their needs, their passions, their characters and talents; and impresses us with the belief that such needs, passions and interests are the sole springs of action — the efficient agents in this scene of activity. Among these may, perhaps, be found aims of a liberal or universal kind — benevolence it may be, or noble patriotism; but such virtues and general views are but insignificant as compared with the World and its doings. We may perhaps see the Ideal of Reason actualized in those who adopt such aims, and within the sphere of their influence; but they bear only a trifling proportion to the mass of the human race; and the extent of that influence is limited accordingly. Passions, private aims, and the satisfaction of selfish desires, are on the other hand, most effective springs of action. Their power lies in the fact that they respect none of the limitations which justice and morality would impose on them; and that these natural impulses have a more direct influence over man than the artificial and tedious discipline that tends to order and self-restraint, law and morality. When we look at this display of passions, and the consequences of their violence; the Unreason which is associated not, only with them, but even (rather we might say especially) with good designs and righteous aims; when we see the evil, the vice, the ruin that has befallen the most flourishing kingdoms which the mind of man ever created, we can scarce avoid being filled with sorrow at this universal taint of corruption: and, since this decay is not the work of mere Nature, but of the Human Will — a moral embitterment — a revolt of the Good Spirit (if it have a place within us) may well be the result of our reflections.

"The Marvelous Brass Chessplaying Automaton", Universe 7 (1977), ed. Terry Carr, Reprinted in Gene Wolfe, Storeys from the Old Hotel (1988), Reprinted in Gene Wolfe, The Best of Gene Wolfe (2009)
Fiction

Source: The Importance of Living (1937), Ch. I : The Awakening, p. 8