“It is an advantage to all narrow wisdom and narrow morals that their maxims have a plausible air; and, on a cursory view, appear equal to first principles. They are light and portable. They are as current as copper coin; and about as valuable. They serve equally the first capacities and the lowest; and they are, at least, as useful to the worst men as to the best. Of this stamp is the cant of not man, but measures; a sort of charm by which many people get loose from every honourable engagement.”

Simon, Herbert A. "The proverbs of administration." Public Administration Review 6.1 (1946): 53-67.
1940s-1950s
Context: Most of the propositions that make up the body of administrative theory today share, unfortunately, this defect of proverbs. For almost every principle one can find an equally plausible and acceptable contradictory principle.

1990s, I Am a Man, a Black Man, an American (1998)

Radio and television report to the American people on civil rights (11 June 1963)]
1963, Civil Rights Address

Under Fire (1916), Ch. 24 - The Dawn
Context: I tell them that fraternity is a dream, an obscure and uncertain sentiment; that while it is unnatural for a man to hate one whom he does not know, it is equally unnatural to love him. You can build nothing on fraternity. Nor on liberty, either; it is too relative a thing in a society where all the elements subdivide each other by force.
But equality is always the same. Liberty and fraternity are words while equality is a fact. Equality should be the great human formula — social equality, for while individuals have varying values, each must have an equal share in the social life; and that is only just, because the life of one human being is equal to the life of another. That formula is of prodigious importance. The principle of the equal rights of every living being and the sacred will of the majority is infallible and must be invincible; all progress will be brought about by it, all, with a force truly divine. It will bring first the smooth bed-rock of all progress — the settling of quarrels by that justice which is exactly the same thing as the general advantage.

Pt. 2, ch. 20
Atticus Finch
To Kill a Mockingbird (1962)

Source: Gaudy Night

Statistical Methods and Scientific Inference, Edinburgh: Oliver and Boyd, 1956, p. 31.
1950s

Half-Truths and One-And-A-Half Truths (1976)

Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 38 ["… moral consciousness is an innate and intimate revelation of the absolute, which exceed every empirical data..." - see above].