Via Starwars.com:

DISCOVER THE WISDOM WITHIN A GRUMPY ASTROMECH DROID AND MORE!
The midseason finale of Season Two of Star Wars Rebels is almost here, and given the timing, it seemed like a fine occasion to look back at what we’ve learned from the series so far. We’ve watched the Ghost crew go from fighting the Empire on Lothal to fighting the Empire across the galaxy. They’ve joined the bigger battle to help push Emperor Palpatine out of power, and they’re winning small victories. The crew of the Ghost has lost, too, but hope keeps them moving forward. Never quitting is maybe one of the biggest lessons to take away from Star Wars Rebels, but these five are important, too.