Is Gintama episode 37 filler?

#37

People Who Say That Santa Doesn't Really Exist Actually Want To Believe In Him Prayer Won't Make Your Worldly Desires Go Away! Control Yourself

サンタなんていねーんだよって言い張る奴こそホントはいるって信じたいんだよ 煩悩が鐘で消えるかァァ己で制御しろ己で

Aired 28 Dec 2006