Our eyes do yet fail [in looking] for our vain help: In our watching we have watched for a nation that could not save.
He says that they were anation which could not save; and there is no doubt but that the Prophet here puts them in mind of the many warnings which had not been received by the Jews, for God had tried to call them back from that ruinous confidence, but without any success; for we know how much the Prophets labored in this respect, but they were never believed until at length experience proved how vain was the help of Egypt, as God had testified by his servants. 