> 11. “Happiness is the meaning and the purpose of life, the whole aim and end of human existence.”

That's a poor way of framing his beliefs about this. The correct framing is more like “Virtue and being a Good Human Being is the meaning and the purpose of life, the whole aim and end of human existence.”

Happiness should stem from being a good human being; happiness itself is not the origin of virtue or purpose.

If personal sacrifice brings genuine well-being to your family or community, that could be a very virtuous and rewarding thing to do, and as such, should make you content and satisfied with your actions and their outcomes. That's how you find eudaemonia; that state of 'happiness' he's describing. While you haven't sought out your immediate personal happiness or gratification, you can still feel good in a morally derivative, intellectual manner (which could also make you genuinely happy or content, too). The bible is big on this theme, as well.

Humans are political animals to Aristotle, and our prosociality and duty to others was crucial to how we measured ourselves and our obligations to society. Personal happiness in a contemporary, conventional sense wasn't very important in that scope. Our ability to be satisfied with, and take gratification from, our service to others was a major part of how you'd derive that contentedness and eudaimonic state of mind.

It seems important to make that distinction, because most people's interpretation of that quote (I don't think it's an actual quote) would be relatively hedonic or epicurean. Everything you do should be in the pursuit of feeling good.