The Greek verb diaginōskō means to investigate thoroughly, determine after examination, or decide through careful inquiry. It appears in Acts 23:15 where the Jewish leaders pretend to want Paul brought back for more 'thorough examination,' and in Acts 24:22 where Felix deferred Paul's case until he could investigate it more thoroughly.
The judicial examination implied in diaginōskō runs through the trial narratives of Paul in Acts. Felix's repeated deferrals under the guise of needing more thorough investigation reveal the corrupt heart of worldly justice — the examination is a pretense to avoid judgment. Paul himself welcomed examination, confident that thorough investigation would vindicate him. This models the Christian posture of integrity: we invite scrutiny because we have nothing to hide. Ultimately, diaginōskō points to the final divine examination — God's omniscient judgment where all will be known thoroughly.