
Proclus, Timaeus, Vol. 1, 121.8-11 (Diehl); quoted in Morris R. Cohen and I. E. Drabkin, A Sourcebook in Greek Science (1948), 383.
About
Stanza 24.
Nosce Teipsum (1599)
Proclus, Timaeus, Vol. 1, 121.8-11 (Diehl); quoted in Morris R. Cohen and I. E. Drabkin, A Sourcebook in Greek Science (1948), 383.
About
“With children the clock is reset. We forget what came before”
Source: The Lowland
“We must each of us bear our own misfortunes.”
Source: True Grit (1968), Chapter 3, p. 32 : 'Colonel Stonehill'
“When we say force is the cause of motion, we talk metaphysics”
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
Source: The State of the World 2010, public lecture in New York City, USA, (July 2010)
2013, Second Inaugural Address (January 2013)
Context: Each time we gather to inaugurate a President we bear witness to the enduring strength of our Constitution. We affirm the promise of our democracy. We recall that what binds this nation together is not the colors of our skin or the tenets of our faith or the origins of our names. What makes us exceptional — what makes us American — is our allegiance to an idea articulated in a declaration made more than two centuries ago: “We hold these truths to be self-evident, that all men are created equal; that they are endowed by their Creator with certain unalienable rights; that among these are life, liberty, and the pursuit of happiness.” Today we continue a never-ending journey to bridge the meaning of those words with the realities of our time. For history tells us that while these truths may be self-evident, they’ve never been self-executing; that while freedom is a gift from God, it must be secured by His people here on Earth.