In general, there are two kinds of questions that come up when we look at the world. These questions can be solved by objective analysis. This is the view of politics, law, religion, etc. This is the domain of rhetoric Corax saw that when people make an argument, they are not so much concerned with what is true, as they are concerned with what is likely to be true, what is probably true. If a small man is accused of beating up a big man, we would think that he probably did not do it, since most of the time, little men don't beat up big men.
Judgments based on probability depend upon experience.
If we have had experience with a thing, then we can make judgments based on that experience. The broader our experience, the more accurate our judgments based on probability. Rhetoric is the art which seeks to capture in opportune moments that which is appropriate and attempts to suggest that which is possible. The most extreme sophists were the erestic sophists. For them, winning isn't everything, it is the only thing.