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There are three constants in life…change, choice and principles.

 

Stephen Covey

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Even if the constants which economists wish to determine were less numerous, and the method of experiment more accessible, we should still be faced with the fact that the constants themselves are different at different times. The gravitation constant is the same always. But the economic constants — these elasticities of demand and supply — depending, as they do, upon human consciousness, are liable to vary. The constitution of the atom, as it were, and not merely its position, changes under the influence of environment.

 

Arthur Cecil Pigou

 

If by sticking to the moral principles you have followed all your life, you jeopardize your happiness and that of others, throw over your principles. Principles for principles' sake -that is not wisdom; that is obstinacy. Principles should be fluid because life is fluid."

 

Epifanio de los Santos

 

Consider what kind of authority [can be ascribed to] any principle which it open to us to choose to regard as authoritative or not. I may choose for example to observe a regimen of asceticism and fasting ... for reasons of health ... What authority such principles possess derives from the reasons for my choice. Insofar as they are good reasons, the principles have corresponding authority; insofar as they are not, the principles are to that same extent deprived of authority. It would follow that a principle for the choice of which no reasons could be given would be a principle devoid of authority. I might indeed adopt such a principle from whim or caprice or from some arbitrary purpose ... but if I then chose to abandon the principle whenever it suited me, I would be entirely free to do so.

 

Alasdair MacIntyre

 

Once we realize that the principles of our actions have no other support than our blind choice, we really do not believe in them anymore... In order to live, we have to silence the easily silenced voice of reason, which tells us that our principles are in themselves as good or as bad an any other principles. The more we cultivate reason, the more we cultivate nihilism...

 

Leo Strauss

 

Pure Mathematics is the class of all propositions of the form “p implies q,” where p and q are propositions containing one or more variables, the same in the two propositions, and neither p nor q contains any constants except logical constants. And logical constants are all notions definable in terms of the following: Implication, the relation of a term to a class of which it is a member, the notion of such that, the notion of relation, and such further notions as may be involved in the general notion of propositions of the above form. In addition to these, mathematics uses a notion which is not a constituent of the propositions which it considers, namely the notion of truth.

 

Bertrand Russell