....because happiness is viewed as having more reason for joy than for vexation - having a positive balance of pleasures over pains. Epicurus had that positive balance even in his last days, and as even the wise man on the wrack can have because he can consider his past experiences and current thinking and upcoming relief from pain (through death if necessary) as offsetting his present torture
Cassius thank you, your post improves my understanding.
Ok, yes seeing the cup as the whole life makes more sense.
"more reason for joy than for vexation - having a positive balance of pleasures over pains"
I first thought: oh that is an opposite image to the full cup model. But on the other side it means the possible pleasure of life.
And fearing of pain makes the cup not fuller but emptier.
I see how this is also connected to the "absence of pain" subject.
To avoid or fear every Pain because it could disturb a perfect fullness or cup is not the Epicurean way when exactly this leads to more pain and fear.
The Epicurean way is to choose Pain when it leads to better/more Pleasure overall. The prudent way to go for Pleasure.