Thus while every word the apostles or Jesus spoke is not recorded what we do have is sufficient to thoroughly train the man of of God for every good work.
Someone might be proud of their schooling and have knowledge (gnosis) but it is not the epignosis that Paul spoke of. They are not equipped for every good work.
We aren’t given everything that happened because we don’t NEED to know everything that happened.
God saw to it that what was needed was transcribed into Scripture and gave it to us.
He said it was enough.
I believe Him.