On the Dangers of "Is and Is Not Not"
There's a simple example to show this; happy. We then have the following:
happy :: not not happy
I am happy :: I am not not happy
I am happy :: I am not unhappy
Now, if we are in fact declaring that we are happy, there is no problem with double negation in this case. Yet, if the declaration is the other way, it's not so easy to double negate.
In this case, it may be more because there is a third option; I am neither happy nor unhappy. In states of affairs in which there are only two options, double negation will serve us well. If something is blue, then it's not not blue. If I'm unhappy, then I'm not happy.
It's therefore important to realize cases in which there are not merely two options, but potentially three or more. In such cases, double negation will do us little good.
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