As if one could know the good a person is capable of, when one doesn't know the bad he might do.
Sometimes you're not sure about a player. Sometimes you doubt. Sometimes you have to guess. Sometimes... you just know.
In 1969, at the age of 19, I was lucky enough to work with George C. Scott in the definitive portrayal of his career over a period of many months and several countries on the definitive film version of Patton's WWII career.