“Because a judgement on the truth or error of the differing convictions in law is impossible, and because on the other hand a uniform law for all citizens is necessary, the law-giver faces the task of cleaving with a stroke of the sword the Gordian knot which jurisprudence cannot untangle. Since it is impossible to ascertain what is just, it must be decided what is lawful. In lieu of an act of truth (which is impossible) an act of authority is required. Relativism leads to positivism.”
Der Relativismus in der Rechtsphilosophie (1934).
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Gustav Radbruch 12
German politician 1878–1949Related quotes

Committee on the Judiary, United States House of Representatives, Plaintiff, v. Donald F. McGahn II, Defendant. (Nov 25, 2019)

Letter to the New Orleans Times http://civilwartalk.com/threads/im-a-good-ole-rebel.34939/page-2#post-352510 (8 June 1867)
Source: Just a Theory: Exploring the Nature of Science (2005), Chapter 3, “Words Scientists Don’t Use: At Least Not the Way You Do” (p. 49)
A Language Older Than Words (2000)

§ 13
1780s, Memorial and Remonstrance Against Religious Assessments (1785)
Context: Attempts to enforce by legal sanctions, acts obnoxious to so great a proportion of Citizens, tend to enervate the laws in general, and to slacken the bands of Society. If it be difficult to execute any law which is not generally deemed necessary or salutary, what must be the case, where it is deemed invalid and dangerous? And what may be the effect of so striking an example of impotency in the Government, on its general authority?

Understanding http://www.poemhunter.com/poem/understanding-4/
From the poems written in English

Thoughts Upon Slavery (1774)
Context: I deny that villany is ever necessary. It is impossible that it should ever be necessary for any reasonable creature to violate all the laws of justice, mercy, and truth. No circumstances can make it necessary for a man to burst in sunder all the ties of humanity. It can never be necessary for a rational being to sink himself below a brute. A man can be under no necessity of degrading himself into a wolf. The absurdity of the supposition is so glaring, that one would wonder any one can help seeing it.

The Spirit of Christianity and its Fate (1799)