“For not all things are practicable on identical principles”

— Vitruvius , book De architectura

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book X, Chapter XVI, Sec. 5

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Vitruvius 203

Roman writer, architect and engineer -80–-15 BC

Joseph Alleine (1634–1668) Pastor, author

Source: An Alarm to the Unconverted aka A Sure Guide to Heaven (first published 1671), P. 30.

“In war, theory is all right so far as general principles are concerned; but in reducing general principles to practice there will always be danger. Theory and practice are the axis about which the sphere of accomplishment revolves.”

Napoleon I of France (1769–1821) French general, First Consul and later Emperor of the French

Napoleon : In His Own Words (1916)

“[I]n principle and in practice, in a right track and in a wrong one, the rarest of all human qualities is consistency.”

Jeremy Bentham book An Introduction to the Principles of Morals and Legislation

Source: An Introduction to the Principles of Morals and Legislation (1789; 1823), Ch. 1 : Of the Principle of Utility

“Few things in life can be so appalling as the difference between a dry antiseptic statement of a principle by a well spoken man in a quiet office, and what happens to people when that principle is put into practice.”

John Kenneth Galbraith (1908–2006) American economist and diplomat

BBC TV Adaptation, Episode 1
The Age of Uncertainty (1977)

“The campaign for birth control is not merely of eugenic value, but is practically identical with the final aims of eugenics.”

Margaret Sanger (1879–1966) American birth control activist, educator and nurse

"The Eugenic Value of Birth Control Propaganda", October 1921, page 5.
Birth Control Review, 1918-32

“It’s important to preserve our cultural practices of our Bolivian people, because they enrich the national identity.”

Jeanine Áñez (1967) President of Bolivia

“Men are unequal in all their relations with the things of this world, without exception. The only thing that is identical in all men is the presence of a link with the reality outside the world.”

Simone Weil (1909–1943) French philosopher, Christian mystic, and social activist

Draft for a Statement of Human Obligation (1943)
Context: It is impossible to feel equal respect for things that are in fact unequal unless the respect is given to something that is identical in all of them. Men are unequal in all their relations with the things of this world, without exception. The only thing that is identical in all men is the presence of a link with the reality outside the world.
All human beings are absolutely identical in so far as they can be thought of as consisting of a centre, which is an unquenchable desire for good, surrounded by an accretion of psychical and bodily matter.