knowledge acquisition
from https://www.psychologytoday.com/us/blog/hide-and-seek/202006/what-is-eudaimonia :
Socrates,
Socrates equated eudaimonia with wisdom and virtue. In the Greater Alcibiades, he says that he who is not wise cannot be happy; in the Gorgias, that no
thing truly bad can ever happen to a good man; and in the Meno, that everything the soul endeavours or endures under the guidance of wisdom ends in happiness.
Plato
Plato he argues that justice and injustice are to the soul as health and disease are to the body: if health in the body is intrinsically desirable, then so is justice in the soul. For Plato, an unjust man cannot be happy because he is not in rational and ordered control of himself.
Aristotle
For Aristotle, a thing is best understood by looking at its end, purpose, or goal. For example, the purpose of a knife is to cut, and it is by seeing this that one best understands what a knife is.
What, asks Aristotle, is this goal that is an end-in-itself? This ‘supreme good’, he replies, is eudaimonia, and eudaimonia only.
Whereas human beings need nourishment like plants, and have sentience like animals, their distinctive function, says Aristotle, is their unique and god-like capacity to reason. Thus, our supreme good is to lead a life that enables us to use and develop our reason, and that is in accordance with rational principles.
By living our life to the full according to our essential nature as rational beings, we are bound to flourish, that is, to develop and express our full human potential, regardless of the ebb and flow of our good or bad fortune.