en_tn_condensed/1jn/02/24.md

As for you

This phrase marks John's switch from talking about other people to talking about the people he is writing to.

let what you have heard from the beginning remain in you

"remember and believe what you have heard from the beginning" or "continue to trust what we have taught you about Jesus when you first became believers"

If what you heard from the beginning remains in you

"If you continue to trust what we first taught you"

also remain in the Son and in the Father

"also continue to have fellowship with the Son and with the Father" or "also stay joined to the Son and to the Father"