
Speaking at the Annual Theos Lecture in London on November 4, Britain's Chief  Rabbi Johnathan Sacks, warned that Europe was bound to meet the same fate as  ancient Greece due to its abysmal failure to inspire larger  families. 
"Parenthood involves massive sacrifice: of money, attention,  time and emotional energy," he said. "Where today, in European culture with its  consumerism and its instant gratification 'because you're worth it,' in that  culture, where will you find space for the concept of sacrifice for the sake of  generations not yet born?"
He observed that sincere religious belief is  able to overcome the cultural impediments to having children. "Wherever you turn  today anywhere in the world, and whether you look at the Jewish or Christian or  Muslim communities, you will find the more religious the community, the larger,  on average, are its families," he said.
Rabbi Sacks cited the alarming  demographics in Europe, stating: "Europe today is the only region in the world  which is experiencing population decline. As you know, zero population growth -  a stable population - requires an average of 2.1 children for every woman of  child-bearing age in the population. Not one European country has anything like  that rate today. Here are the 2004 figures: In the United Kingdom: 1.74, in the  Netherlands: 1.73, Germany: 1.37, Italy: 1.33, Spain: 1.32 and Greece:  1.29."
He added: "Europe, at least the indigenous population of Europe,  is dying, exactly as Polybius said about ancient Greece in the third  pre-Christian century. The century that is intellectually the closest to our own  - the century of the sceptics and the epicureans and the  cynics." 
Quoting Polybius he stated: "The fact is, that the people of  Hellas had entered upon the false path of ostentation, avarice and laziness, and  were therefore becoming unwilling to marry, or if they did marry, to bring up  the children born to them; the majority were only willing to bring up at most  one or two."
Rabbi Sacks, who was recently admitted to the House of  Lords, concluded, "That is why Greece died. That is where Europe is  today."
He called this "one of the un-sayable truths of our time."