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I define a Sign as anything which is so determined by something else, called its Object, and so determines an effect upon a person, which effect I call its Interpretant, that the latter is thereby mediately determined by the former.
--
Letter to Victoria, Lady Welby (1908) SS 80-81

 

Charles Sanders Peirce

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Is it an excellence in your love that it can love only the extraordinary, the rare? If it were love’s merit to love the extraordinary, then God would be — if I dare say so — perplexed, for to Him the extraordinary does not exist at all. The merit of being able to love only the extraordinary is therefore more like an accusation, not against the extraordinary nor against love, but against the love which can love only the extraordinary. Perfection in the object is not perfection in the love. Erotic love is determined by the object; friendship is determined by the object; only love of one’s neighbor is determined by love. Therefore genuine love is recognizable by this, that its object is without any of the more definite qualifications of difference, which means that this love is recognizable only by love.

 

Soren Aabye Kierkegaard

 

In all things success depends on previous preparation, and without such previous preparation there is sure to be failure. If what is to be spoken be previously determined, there will be no stumbling. If affairs be previously determined, there will be no difficulty with them. If one's actions have been previously determined, there will be no sorrow in connection with them. If principles of conduct have been previously determined, the practice of them will be inexhaustible.

 

Confucius

 

I maintain that inversion is the effect of neither a prenatal choice nor an endocrinal malformation nor even the passive and determined result of complexes. It is an outlet that a child discovers when he is suffocating.

 

Jean-Paul Sartre

 

If the sign were not related to its object except by the mind thinking of them separately, it would not fulfil the function of a sign at all. Supposing, then, the relation of the sign to its object does not lie in a mental association, there must be a direct dual relation of the sign to its object independent of the mind using the sign. In the second of the three cases just spoken of, this dual relation is not degenerate, and the sign signifies its object solely by virtue of being really connected with it. Of this nature are all natural signs and physical symptoms. I call such a sign an index, a pointing finger being the type of the class.
The index asserts nothing; it only says "There!" It takes hold of our eyes, as it were, and forcibly directs them to a particular object, and there it stops. Demonstrative and relative pronouns are nearly pure indices, because they denote things without describing them; so are the letters on a geometrical diagram, and the subscript numbers which in algebra distinguish one value from another without saying what those values are.

 

Charles Sanders Peirce

 

Those who are skeptical about carbon dioxide greenhouse warming might profitably note the massive greenhouse effect on Venus. No one proposes that Venus's greenhouse effect derives from imprudent Venusians who burned too much coal, drove fuel-inefficient autos, and cut down their forests. My point is different. The climatological history of our planetary neighbor, an otherwise Earthlike planet on which the surface became hot enough to melt tin or lead, is worth considering — especially by those who say that the increasing greenhouse effect on Earth will be self-correcting, that we don't really have to worry about it, or (you can see this in the publications of some groups that call themselves conservative) that the greenhouse effect is a "hoax".

 

Carl Sagan