In the birth of Isaac, Abraham at length sees the long-delayed fulfilment of the promise. But his trials are by no means over. He has himself introduced into his family the seeds of discord and disturbance, and speedily the fruit is borne. Ishmael, at the birth of Isaac, was a lad of fourteen years, and, reckoning from Eastern customs, he must have been over sixteen when the feast was made in honour of the weaned child. Certainly he was quite old enough to understand the important and not very welcome alteration in his prospects which the birth of this new son effected. He had been brought up to count himself the heir of all the wealth and influence of Abraham. There was no alienation of feeling between father and son: no shadow had flitted over the bright prospect of the boy as he grew up; when suddenly and unexpectedly there was interposed between him and his expectation the effectual barrier of this child of Sarah's. The importance of this child to the family was in due course indicated in many ways offensive to Ishmael; and when the feast was made, his spleen could no longer be repressed. This weaning was the first step in the direction of an independent existence, and this would be the point of the feast in celebration. The child was no longer a mere part of the mother, but an individual, a member of the family. The hopes of the parents were carried forward to the time when he should be quite independent of them. But in all this there was great food for the ridicule of a thoughtless lad. It was precisely the kind of thing which could easily be mocked without any great expenditure of wit by a boy of Ishmael's age. The too visible pride of the aged mother, the incongruity of maternal duties with ninety years, the concentration of attention and honours on so small an object,--all this was, doubtless, a temptation to a boy who had probably at no time too much reverence. But the words and gestures which others might have disregarded as childish frolic, or, at worst, as the unseemly and ill-natured impertinence of a boy who knew no better, stung Sarah, and left a poison in her blood that infuriated her. "Cast out that bondwoman and her son," she demanded of Abraham. Evidently she feared the rivalry of this second household of Abraham, and was resolved it should come to an end. The mocking of Ishmael is but the violent concussion that at last produces the explosion, for which material has long been laid in train. She had seen on Abraham's part a clinging to Ishmael, which she was unable to appreciate. And though her harsh decision was nothing more than the dictate of maternal jealousy, it did prevent things from running on as they were until even a more painful family quarrel must have been the issue.