They misunderstood why they were called and the nature of their call.They thought God had called them primarily to bless them, to give them something. Thus they failed to carry out the purpose of their call; In mt.21- the parable of the two sons.....the second son symbolizes Israel. Go work in my vineyard.....he said he would , but did not God said to the people of Israel go work in my vineyard,but they would not. they said they would do it, but they did not, they failed. God calls a new Israel,you and I make the audacious claim that we are a part of this "new" Israel of God. But the thing we must understand with clarity is.... The New Israel is called for precisely the same purpose as was the original Israel. While belief was involved....the emphasis was on the results, the fruits, the expression of valid belief. the people involved were not rejected because they did not believe, but they failed to fulfill the purpose for which they were called.