We are told, with good reason, that all human achievements are built on sand, and that our victories and our misfortunes are fleeting.We cannot foresee the future, let alone determine it.The most we can achieve in family life is a better future for our children, but it is up to them to build on that future.Likewise, as Prime Minister, the greatest thing I aspired to achieve at the time was to give my successor a better country. …