“Mutinies are crushed in accordance with eternal and unchanging iron laws.”

De Re Publica [Of The Republic], Book III Section 22; as translated by Francis Barham
Variant translations:
True law is right reason in agreement with nature; it is of universal application, unchanging and everlasting; it summons to duty by its commands, and averts from wrongdoing by its prohibitions. And it does not lay its commands or prohibitions upon good men in vain, though neither have any effect on the wicked. It is a sin to try to alter this law, nor is it allowable to attempt to repeal any part of it, and it is impossible to abolish it entirely. We cannot be freed from its obligations by senate or people, and we need not look outside ourselves for an expounder or interpreter of it. And there will not be different laws at Rome and at Athens, or different laws now and in the future, but one eternal and unchangeable law will be valid for all nations and all times, and there will be one master and ruler, that is, God, over us all, for he is the author of this law, its promulgator, and its enforcing judge. Whoever is disobedient is fleeing from himself and denying his human nature, and by reason of this very fact he will suffer the worst penalties, even if he escapes what is commonly considered punishment.
As translated by Clinton W. Keyes (1928)<!-- ; in De Re Publica, De Legibus (1943), p. 211 -->
Context: There is a true law, a right reason, conformable to nature, universal, unchangeable, eternal, whose commands urge us to duty, and whose prohibitions restrain us from evil. Whether it enjoins or forbids, the good respect its injunctions, and the wicked treat them with indifference. This law cannot be contradicted by any other law, and is not liable either to derogation or abrogation. Neither the senate nor the people can give us any dispensation for not obeying this universal law of justice. It needs no other expositor and interpreter than our own conscience. It is not one thing at Rome and another at Athens; one thing to–day and another to–morrow; but in all times and nations this universal law must for ever reign, eternal and imperishable. It is the sovereign master and emperor of all beings. God himself is its author,—its promulgator,—its enforcer. He who obeys it not, flies from himself, and does violence to the very nature of man. For his crime he must endure the severest penalties hereafter, even if he avoid the usual misfortunes of the present life.

Source: Fell

V, 11, 10.
Historiarum Alexandri Magni Macedonis Libri Qui Supersunt, Book V

As quoted in A Dictionary of Thoughts: Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, Both Ancient and Modern (1891) by Tryon Edwards, p. 17; an earlier statement of such sentiments was made by Benjamin Disraeli in Vivian Grey (1826), Book VI, Ch. 7: "all power is a trust; that we are accountable for its exercise; that from the people and for the people all springs, and all must exist." Parker was also very likely familiar with Daniel Webster's statements referring to "The people's government, made for the people, made by the people, and answerable to the people" in a speech on Foot's Resolution (26 January 1830); the most famous use of such phrasing came in Abraham Lincoln's, Gettysburg Address (19 November 1863) when using words probably inspired by Parker's he declared: "we here highly resolve that these dead shall not have died in vain — that this nation, under God, shall have a new birth of freedom — and that government of the people, by the people, for the people, shall not perish from the earth." Fifty eight years later, in 1921, Dr. Sun Yat-sen (1866-1925), Founder of Modern China, credited Lincoln's immortal words as the inspiration of his Three Principles of the People (三民主义) articulated in a speech delivered on March 6, 1921, at a meeting of the Executive Committee of the National People’s Party in Guangzhou. The Three Principles of the People are still enshrined in the Constitution of Taiwan. According to Lyon Sharman, "Sun Yat-sen: His Life and Its Meaning, a Critical Biography" (Stanford: Stanford University Press, 1934), Dr. Sun wrote that his own three principles “correspond with the principles stated by President Lincoln—‘government of the people, by the people, for the people.’ I translated them into … the people (are) to have . . . the people (are) to govern and . . . the people (are) to enjoy.”

Variant: The Tao that can be told is not the eternal Tao;
The name that can be named is not the eternal name.
The nameless is the beginning of heaven and earth.
Source: Tao Te Ching, Ch. 1, as translated by Ch'u Ta-Kao (1904)
Also as Tao called Tao is not Tao.
Context: The Tao that can be expressed is not the eternal Tao; The name that can be defined is not the unchanging name.
Non-existence is called the antecedent of heaven and earth; Existence is the mother of all things.
From eternal non-existence, therefore, we serenely observe the mysterious beginning of the Universe; From eternal existence we clearly see the apparent distinctions.
These two are the same in source and become different when manifested.
This sameness is called profundity. Infinite profundity is the gate whence comes the beginning of all parts of the Universe.

The American Idea https://en.wikisource.org/wiki/Discourses_of_Slavery/Speech_in_Boston,_May_29,_1850,_on_Slave_Power_in_America, a speech at New England Anti-Slavery Convention, Boston (29 May 1850)
Variant : This is what I call the American idea of freedom — a government of all the people, by all the people, for all the people; of course, a government of the principles of eternal justice — the unchanging law of God.
As quoted in A Dictionary of Thoughts: Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, Both Ancient and Modern (1891) by Tryon Edwards, p. 17; an earlier statement of such sentiments was made by Benjamin Disraeli in Vivian Grey (1826), Book VI, Ch. 7: "all power is a trust; that we are accountable for its exercise; that from the people and for the people all springs, and all must exist." Parker was also very likely familiar with Daniel Webster's statements referring to "The people's government, made for the people, made by the people, and answerable to the people" in a speech on Foot's Resolution (26 January 1830); the most famous use of such phrasing came in Abraham Lincoln's, Gettysburg Address (19 November 1863) when using words probably inspired by Parker's he declared: "we here highly resolve that these dead shall not have died in vain — that this nation, under God, shall have a new birth of freedom — and that government of the people, by the people, for the people, shall not perish from the earth." Fifty eight years later, in 1921, Dr. Sun Yat-sen (1866-1925), Founder of Modern China, credited Lincoln's immortal words as the inspiration of his Three Principles of the People (三民主义) articulated in a speech delivered on March 6, 1921, at a meeting of the Executive Committee of the National People’s Party in Guangzhou. The Three Principles of the People are still enshrined in the Constitution of Taiwan. According to Lyon Sharman, "Sun Yat-sen: His Life and Its Meaning, a Critical Biography" (Stanford: Stanford University Press, 1934), Dr. Sun wrote that his own three principles “correspond with the principles stated by President Lincoln—‘government of the people, by the people, for the people.’ I translated them into … the people (are) to have . . . the people (are) to govern and . . . the people (are) to enjoy.”
Context: There is what I call the American idea. I so name it, because it seems to me to lie at the basis of all our truly original, distinctive, and American institutions. It is itself a complex idea, composed of three subordinate and more simple ideas, namely: The idea that all men have unalienable rights; that in respect thereof, all men are created equal; and that government is to be established and sustained for the purpose of giving every man an opportunity for the enjoyment and development of all these unalienable rights. This idea demands, as the proximate organization thereof, a democracy, that is, a government of all the people, by all the people, for all the people; of course, a government after the principles of eternal justice, the unchanging law of God; for shortness' sake, I will call it the idea of Freedom.

According to Kenneth Owen Morgan (The Illustrated History of Britain (1984) p. 421) this was said by Macaulay in 1832. If so, he was quoting a letter written by Edmund Burke in 1777.
Attributed

Plato, Phaedo

Jane Eyre