I got curious about it several decades ago have had some time to ponder and read.

https://howtobeastoic.wordpress.com/2016/01/19/one-crucial-word/

Amathia. It is often translated as “ignorance,” as in the following two famous quotes from Socrates:

“Wisdom alone, is the good for man, ignorance the only evil” (Euthydemus 281d)

“There is, he said, only one good, that is, knowledge, and only one evil, that is, ignorance” (in Diogenes Laertius, II.31)

That’s the opening lines of the article. It’s only 2-3 page, a couples of minutes read. I really do strongly suggest it.