V. 18.— Of whom it was said, That in Isaac shall thy seed be called. Of whom it was said, In Isaac shall thy seed he called.— God had promised that in Abraham's seed all the families of the earth should be blessed, and He had said as expressly that this should be fulfilled in the line of Isaac. Must not, then, the death of Isaac preclude the fulfilment of the promises? No; Abraham was persuaded that the promises should all be fulfilled. He knew that He was faithful who had promised, and therefore on this subject there could not be any doubt.