Berean Standard Bible (BSB)
so that you may know the certainty of the things you have been taught.
World English Bible (WEB)
that you might know the certainty concerning the things in which you were instructed.
Strong's King James
That{G2443} thou mightest know{G1921}{(G5632)} the certainty{G803} of{G4012} those things{G3056}, wherein{G3739} thou hast been instructed{G2727}{(G5681)}.
The F.O.G *
(4) In order that you may know the certainty about the words you've been orally instructed.
The F.O.G Message *
Young's Literal Translation
that thou mayest know the certainty of the things wherein thou wast instructed.