“A human being will accept the strictest disciplinary measures with a better grace if he knows that they will fall with equal severity on his neighbor. Justice in some mysterious way makes up for violence.”

De causa Dei contra Pelagium

Meditations on the Sacraments (1977), Introduction, p. xi.
Context: Grace is everywhere as an active orientation of all created reality toward God, though God does not owe it to any creature to give it this special orientation. Grace does not happen in isolated instances here and there in an otherwise profane and graceless world. It is legitimate, of course, to speak of grace-events which occur at discrete points in space and time. But then what we are really talking about is the existential and historical acceptance of this grace by human freedom. … Grace itself … is everywhere and always, even though a human being's freedom can sinfully say no to it, just as a human being's freedoms can protest against humankind itself. This immanence of grace in the conscious world always and everywhere does not take away the gratuity of grace, because God's immediacy out of self-giving love is not something anyone can claim as his or her due. The immanence of grace always and everywhere does not make salvation history cease to be history, because history is the acceptance of grace by the historical freedom of human beings and the history of spirit coming ever more to itself in grace.

Investigations have failed to confirm this in Emerson's writings (John H. Lienhard. "A better moustrap" http://www.uh.edu/engines/epi1163.htm, Engines of our Ingenuity). Also reported as a misattribution in Paul F. Boller, Jr., and John George, They Never Said It: A Book of Fake Quotes, Misquotes, & Misleading Attributions (1989), p. 25. Note that Emerson did say, as noted above, "I trust a good deal to common fame, as we all must. If a man has good corn, or wood, or boards, or pigs, to sell, or can make better chairs or knives, crucibles or church organs, than anybody else, you will find a broad hard-beaten road to his house, though it be in the woods".
Misattributed

I Think I'll Sit This One Out (1939)
Context: Justice alone knows liberty, equality, and fraternity, and justice is a human virtue arising from man's human capacity to reason. We cannot make sense out of justice by looking at the moon or taking dope or building battleships. We can make sense out of justice by using our reason to discover that justice, like wisdom, is better than rubies.

2000s, Youth Q&A on the U.N. High-Level Panel on the Post-2015 Agenda Report (2009)

Sec. 98
Some Thoughts Concerning Education (1693)
Context: He will better comprehend the foundations and measures of decency and justice, and have livelier, and more lasting impressions of what he ought to do, by giving his opinion on cases propos'd, and reasoning with his tutor on fit instances, than by giving a silent, negligent, sleepy audience to his tutor's lectures; and much more than by captious logical disputes, or set declamations of his own, upon any question. The one sets the thoughts upon wit and false colours, and not upon truth; the other teaches fallacy, wrangling, and opiniatry; and they are both of them things that spoil the judgment, and put a man out of the way of right and fair reasoning; and therefore carefully to be avoided by one who would improve himself, and be acceptable to others.

Source: Skin Game

Source: 1970s, Margaret Mead: Some Personal Views (1979), p. 249