en_tn/eph/04/21.md

I assume that you have heard ... and that you were taught

Paul knows that the Ephesians have heard and been taught. (See: rc://en/ta/man/translate/figs-irony)

you were taught in him

Possible meanings are 1) "Jesus' people have taught you" or 2) "someone has taught you because you are Jesus' people." (See: rc://en/ta/man/translate/figs-activepassive)

as the truth is in Jesus

"as everything about Jesus is true"