The signs of bodily decline in ourselves and others are a call to young and old to prepare for eternity.  This is a book for young and old, whether in good or poor health.  We must prepare for eternity and we cannot put this off until we think it is imminent.  Ecclesiastes 12 urges this wise instruction through striking pictures of physical decline.  Alexander Nisbet draws out the way in which this spiritual wisdom applies urgently to each one of us.