We must supply the omitted verb ediwxa (pursued) from verse 2 Corinthians 31 . That explains the rest. They stumbled at the stone of stumbling (prosekopsan twi liqwi tou proskommato). The quotation is from Isaiah 8:14 . Proskoptw means to cut (koptw) against (pro) as in Matthew 4:6 ; John 11:9 . The Jews found Christ a skandalon ( 1 Corinthians 1:23 ).