According to most eastern religions like Buddhism and Hinduism all human beings reincarnate on Earth and go through many, many cycles of birth-death-rebirth. So, all of us have been through thousands of lifetimes. Eventually after we have achieved 'enlightenment', we are liberated from this cycle of birth-death-rebirth and move on to higher realms without any need to be reborn on Earth. All of us eventually 'graduate' from this Earthly school and no longer need to reincarnate.
For some reason, this liberation from the cycle of birth-death-rebirth has eluded most of the members of the Jewish race. In other words, most Jews are very, very old souls who have spent far more lives on Earth than members of most of the other races and religions. Jews are like people who have attended the same grade in school many, many times. Hence, having experienced life on Earth more times than most other people, they are by far the smartest race (in terms of Earthly smartness).
BTW this explanation was given to me by a very wise old man who was knowledgeable in many esoteric matters (and who has now passed on). I don't know how much truth there is in it, but I offer it for your consideration