Paul and Silas were arrested and beaten while under the false assumption they were Jews. Cast into prison they held back and bit their tongue only to wait for justice above the circumstance and instead be faithful with where they are. By focusing on being faithful to their calling for the immediate people around them (...guards) and NOTcry 'injustice' at the people, nor at God.  They waiting for God to deliver them from their circumstance while they chose to share about Jesus to the guards. 
focusing on circumstance, people came to repentance and believed. Remember, Paul and Silas were ARRESTED as 'foreigners' in the boundaries of Rome.  But Paul was a Roman Citizen... and that was a 'no-no'. They didn't

Work life isn't fair? Do you feel those around you aren't playing 'fair'?  Are you focusing only on circumstance? Don't.  Be encouraged and empowered; focus on being faithful where you are at in sharing about Jesus, let God change the circumstance.... and He will in his time.

(story found in Act 16, the second half)