A new piece is up on ‘The Everyman,’ this one discussing how false logic doesn’t work even if everyone agrees about it:
When I say or write a word, such as “four,” I am attempting to convey an idea that is in my head to yours. Our minds have no direct common communication, so the only way I can do that is to create signs in the environment we share, such as sounds or images. These, by common consent, correspond to particular ideas. That this is by consent rather than by nature can be seen by the fact that the same ideas can be expressed by totally different sounds: ‘four,’ ‘quattuor,’ ‘she,’ and so on all convey the same idea, only in the established ‘styles’ of English, Latin, and Japanese. Likewise, the same sounds can be used to convey different ideas: ‘four’ sounds the same as ‘for’ and ‘fore,’ but they all mean different things.
From there, take a step back from the words to consider the ideas themselves. Ideas are reflections of perceived realities. The idea ‘rock’ is the reflection in my mind of a particular reality that I encounter. It may or may not be a completely accurate reflection; if I see a given rock, I may believe that it is heavy (that is, my idea of it is as something heavy), only to find when I pick it up that it is light, whereupon the idea in my head would change to more closely resemble the actual rock itself. This what we mean by calling our thoughts ‘true’ or ‘false.’ A true thought accurately reflects the reality it corresponds to, as far as it goes, while a false one does not (as we will see, this applies to more abstract concepts as well as to concrete physical reality).
Thus, there are three elements in any given word: the sounds or symbols that make up the word itself (such as ‘four’), the idea that is being conveyed, and the reality that this idea reflects.
Now, we have established that the words used are a matter of convention and consent; that everyone in a particular region agreed to use the sound ‘four’ to convey that particular idea. However, the idea itself is nota matter of convention, because it reflects an objective reality that we encounter in the real world (or at least an objective concept).
Go here to read the rest.