A question is raised by the Talmud:
Why was it so rare that great scholars had illustrious sons or descendants?
The point is that there is no guarantee of the continuation of trends.
Therefore, it is of no importance and of no avail to consider one given family or race as superior to another.
–Rabbi Adin Steinsaltz
From "Man Was Created One," in On Being Free by Rabbi Adin Steinsaltz