Freedom is not won by merely overthrowing a tyrannical ruler or an oppressive regime. That is usually only the prelude to a new tyranny, a new oppression.

Frequent worshippers are also significantly more active citizens. They are more likely to belong to community organizations, especially those concerned with young people, health, arts and leisure, neighborhood and civic groups and professional associations.

Science will explain how but not why. It talks about what is, not what ought to be. Science is descriptive, not prescriptive; it can tell us about causes but it cannot tell us about purposes. Indeed, science disavows purposes.

The Jewish festival of freedom is the oldest continuously observed religious ritual in the world. Across the centuries, Passover has never lost its power to inspire the imagination of successive generations of Jews with its annually re-enacted drama of slavery and liberation.

We have lots of heroes today - sportsmen, supermodels, media personalities. They come, they have their 15 minutes of fame, and they go. But the influence of good teachers stays with us. They are the people who really shape our lives.

Anti-Semitism is best understood as a virus. It has no logic. Jews were hated because they were rich and because they were poor; because they were capitalists and because they were communists; because they held tenaciously to an ancient faith and because they were rootless cosmopolitans, believing nothing. Hate needs no logic. It is a sickness of the soul.

Yom HaShoah is a vital day in the Jewish calendar, providing us with a focal point for our remembrance. We cannot bring the dead back to life, but we can bring their memory back to life and ensure they are not forgotten. We can undertake in our lives to do what they were so cruelly prevented from doing in theirs.