I don't know what the policy is on quoting authors, etc, but...
You guys reek of Schopenhauer.
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I've never been a big fan of pessimistic thought such as
absence of pain is pleasure, there is no true happiness, only lack of sadness simply because I feel happiness. I do not feel an illusion. The basis for any productive philosophical argument sits on trusting that (ok, not really, but how practical is pure rationalism, really?). Drawing from science for a moment, all those chemicals in our brain that correspond to happiness and sadness exist representative of those emotions. As far as I know, happiness is not the absence of the sad brain fluid.
If someone is drugged with increasing amounts of dopamine their entire lives, are they not eternally happy?