2 Corinthians 2:12-17

v12-13: We should give God our thanks every time He opens a door for our mouths to speak the gospel or He opens the hearts of our hearers to respond to it.

v14-17: The gospel will have varying success in the people who hear it.  Some will be saved by it, while others will perish under it.  Whether we see success or not, we are called to be faithful.  Faithful in speaking the true gospel found in Scripture and faithful in actually speaking this gospel to people.