having good behavior among the nations, so in that which they speak against you as evil-doers, they may by your good works, which they see, glorify God in the day of visitation.
Jesus is a cornerstone, the foundation upon which the church is built, but yet He is also a stumbling stone. The Jews stumble over Him because of the crucifixion. They could not understand the Messiah being crucified and so they stumbled over this stone. He became a rock of offence to them.