Source: Address to Parliament http://www.loc.gov/teachers/classroommaterials/presentationsandactivities/presentations/timeline/amrev/shots/address.html (27 October 1775).
1860s, Letter to Horace Greeley (1862)
Discussion with Jacob Burckhardt, League of Nation commissioner. Quoted in Norman Rich, Hitler's War Aims: Ideology, the Nazi State, and the Course of Expansion pg. 126 https://books.google.com/books?id=1nPPbpXUZA0C&pg=PA126&dq=hitler+is+against+russia+the+west&hl=en&sa=X&ved=0ahUKEwjR3PP6n5bXAhVC6CYKHTKJB3EQ6AEISjAG#v=onepage&q=hitler%20is%20against%20russia%20the%20west&f=false
1930s
1790s, The Age of Reason, Part I (1794)
“If you wish,
I shall grow irreproachably tender:
not a man, but a cloud in trousers!”
Page 61.
The Cloud in Trousers (1915)
“When shall we say two forces are equal?”
Source: Science and Hypothesis (1901), Ch. VI: The Classical Mechanics (1905) Tr. https://books.google.com/books?id=5nQSAAAAYAAJ George Bruce Halstead
Context: What is mass? According to Newton, it is the product of the volume by the density. According to Thomson and Tait, it would be better to say that density is the quotient of the mass by the volume. What is force? It, is replies Lagrange, that which moves or tends to move a body. It is, Kirchhoff will say, the product of the mass by the acceleration. But then, why not say the mass is the quotient of the force by the acceleration?
These difficulties are inextricable.
When we say force is the cause of motion, we talk metaphysics, and this definition, if one were content with it, would be absolutely sterile. For a definition to be of any use, it must teach us to measure force; moreover that suffices; it is not at all necessary that it teach us what force is in itself, nor whether it is the cause or the effect of motion.
We must therefore first define the equality of two forces. When shall we say two forces are equal? It is, we are told, when, applied to the same mass, they impress upon it the same acceleration, or when, opposed directly one to the other, they produce equilibrium. This definition is only a sham. A force applied to a body can not be uncoupled to hook it up to another body, as one uncouples a locomotive to attach it to another train. It is therefore impossible to know what acceleration such a force, applied to such a body, would impress upon such an other body, if it were applied to it. It is impossible to know how two forces which are not directly opposed would act, if they were directly opposed.
We are... obliged in the definition of the equality of the two forces to bring in the principle of the equality of action and reaction; on this account, this principle must no longer be regarded as an experimental law, but as a definition.<!--pp.73-74
Letter to Joseph Huey (6 June 1753); published in Albert Henry Smyth, The Writings of Benjamin Franklin, volume 3, p. 144.
Epistles
Guide for the Perplexed (c. 1190), Introduction
“If we wait for the moment when everything, absolutely everything is ready, we shall never begin.”
