@ Cassius : With regard to the gods, I agree (but there remains the idealist-versus-realist question…). With regard to pleasure=absence of pain, that formula is somewhat dependent on the context of Epicurean philosophy (in which there is no “neutral” state) – much, perhaps, as pathe in Stoicism needs to be understood, formulaically, as something other than eupathe.
But – on his deathbed, Epicurus was clearly in pain. He was able to find compensating pleasure (and happiness) elsewhere. That is part of the power of the philosophy.
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In that context , I think we stop trying for non-contextual understandings generally. A famous (infamous?) Wittgenstein quote on terminology: "Don't look for the meaning; look for the use."