{Prove all things} (panta [de] dokimazete). Probably de
(but) is genuine. Even the gift of prophecy has to be tested
( 1Co 12:10  14:29 ) to avoid error. Paul shows fine balance
here. {Hold fast that which is good} (	o kalon katechete). Keep
on holding down the beautiful (noble, morally beautiful). Present
imperative kat-ech(935c) (perfective use of kata- here).