Creating a concise explanation would also be the basis and reasoning behind recognizing that the soul is mortal and that the gods are indifferent.
This might be of interest: Chapter 2 - "Atomic Worlds" of Catherine Wilson's book Epicureanism: A Very Short Introduction (but I don't have it)...here is a link to the overview:
https://academic.oup.com/book/746/chapter-abstract/135401379?login=false&redirectedFrom=fulltext
QuoteWilson's insights into atomic worlds highlight a shift from traditional philosophical views that often incorporate divine oversight or eternal consequences. Instead, she advocates for a perspective grounded in materialism and the understanding of nature, which can lead to a more liberated and pleasurable existence.