From the standpoint of eternity there are really only two kinds of people: the sheep of Jesus, and those who are not his sheep. And, though it is true that his sheep always come to believe on him, it is not adequate to define the sheep simply as those who believe. For Jesus clearly taught that one must be his sheep in order to believe. Being his sheep is why one does believe. Therefore, there is more to being a sheep than the human act of believing.