In scenarios where the metaphorical glass is either half-full or half-empty, so to speak, are there any compelling rational reasons to come down on one side or the other? Or is a person's optimism or pessimism just a character trait independent of rational thought?

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Well, there may be certain ontological commitments or implications of choosing one over the other. (This would be independent of one's "optimism/pessimism"...) For example, in the medievals there was extensive discussion about what constituted "real being" and what only seemed real, but was in fact either derivative or conceptual or negative being. So, for one example, it was argued that light is "real" while shadows, which SEEM real, can be "thought of" as if they were real, in fact are not: shadow is merely the absence of light. A lot could ride on this: all real being (for example) would require a cause of its being, while derivative or non-beings would not. So if there is light you need to explain what causes the light; but if there is darkness, you don't need something which "generates" darkness, since darkness is not a real existent, but the absence of the real existent. That being said, there is something to say for preferring the glass being half-full -- for then you are speaking of what's really in there, the water (say), which reaches to the halfway point; but if you say it is half empty you are perhaps suggesting it is half-filled with emptiness, which is, of course absurd: emptiness is not any kind of real being, so nothing can be "full" of it .....

Just half a thought!

best, ap

Thank you Andrew, for this thoughtful response. I have been wanting to respond with notions of false dichotomies and the like, but yours is far more probing and engaging. In my thought world, however, when someone asks me if the glass is half-empty or half-full (as my academic dean did once!) I simply say it is neither - it is time for a refill!

In Vino Veritas, and cheers,

bjm

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