Prowess is mastery. For the chef, it may mean sharpening their knife every time it is used. For the attorney, it may mean improving the inflection in their voice so that their argument is more readily heard. For the parent, it may mean changing how they teach something so that their child can learn it better.
Probity is the quality of having strong moral principles like honesty and decency.
Both can be concentrated in a person or a profession. Fatherly prowess. Fatherly probity. Legal prowess. Legal probity.
Great people join mastery coupled with strong moral principles. Prowess with probity.