A man in the Talmud (Bava Batra 58a) once overheard his wife whispering to their daughter. Of their ten sons, she admitted, only one was truly his. She would not say which.
The father died soon after. His will left everything to one son, but refused to name him. Ten brothers, one inheritance, and no way to tell which of them was intended. They went to Rabbi Benaah and asked him to settle it.
Rabbi Benaah gave them a chilling instruction. "Go to your father's grave and beat on it. Keep beating until he rises and tells you himself which son he meant."
Nine of them marched off to do it. One refused. He would not strike his father's grave, whatever the cost. Rabbi Benaah turned to him and said, "The inheritance is yours. A son who honors his father even after death is the son a father loves best. That is the son your father meant." The other nine got nothing.
The disappointed brothers went straight to the Roman authorities and denounced Rabbi Benaah as a man who robbed heirs without witnesses or proof. He was thrown in prison. But his wisdom in court was so sharp, and his sense of justice so obvious, that the authorities released him almost as quickly as they had locked him up.
The story, preserved in the 1901 anthology Hebraic Literature, sits on a quiet hinge. Rabbi Benaah could not know in advance which son was the biological heir. He did not need to. What he needed was the one who would still honor a father he could not please. Character, in the Rabbis' view, is the only truly legible signature on a life.