Joseph survived the slander, and Targum Pseudo-Jonathan explains why. "He returned to abide in his early strength, and would not yield himself unto sin, and subdued his inclinations by the strong discipline he had received from Jakob" (Genesis 49:24).
The Aramaic assigns the credit carefully. Joseph did not resist Potiphar's wife because he was born incapable of desire. He resisted because his father had taught him how. Mussar — moral discipline — passed from Jacob to Joseph in the years before the brothers threw him in the pit. Years later, alone in a foreign house with an aggressive seductress and no father in sight, Joseph reached for the training that had taken root in him at home.
The Targum closes with a detail from Israel's priestly future. Joseph became "worthy of being a ruler, and of being joined in the engraving of the names upon the stones of Israel." On the High Priest's breastplate, twelve stones bore the names of the twelve tribes (Exodus 28:21). Joseph's name was among them. Every time the High Priest walked into the Sanctuary, he carried Joseph's restraint on his chest. A father's early lessons, the Targum is saying, can be inscribed on the stones of a nation.