Dr. Luther explains this so clearly.

Concordia and Koinonia

Text:  St. Luke 2:  33-40, in particular for this quote:

34 And Simeon blessed them and said to Mary his mother, “Behold, this child is appointed for the fall and rising of many in Israel, and for a sign that is opposed 35 (and a sword will pierce through your own soul also), so that thoughts from many hearts may be revealed.”

“If you wish to be a Christian, know for a certainty that your Lord Jesus Christ, you, your teaching, and all your activity will not be pleasing to the world.  For here you hear that the Lord Jesus Christ himself is a stone of contention and hateful stumbling block for those chosen people of God, and for all those who consider themselves great, mighty, intelligent and righteous.  They find Christ’s teaching offensive, then stumble and fall over it.  If you to be considered a fool, a heretic, a deceiver…

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