QuoteIt's not something like this philosopher said this, or this is said elsewhere in a particular passage of the text of this and that scholar or thinker with a particular quote of a context of this and that... That is not philosophy. That is Philology which is a study of what has been said of something.
For better or for worse, there is a necessary philological component to this particular philosophy. In modern philosophy the complete original works of various philosophers can be read. Only a small fraction of Epicurus' original works survive. Much of what we have to work with are secondary sources and fragments, so it's important to understand the context of this and that in order to properly address the abstractions.