Justice Potter Stewart, A United States Supreme court Justice who sat on the Court in the 1960s, said it best in the case of Jacobellis v. Ohio. He had a concurring opinion as he agreed in the result but not how the majority got there. This was an opinion dealing with obscenity and whether or not a film was obscene. (The justices watched the film as part of their decision-making- oh, to have been a fly on the wall)
Justice Stewart said, in part, “under the First and Fourteenth Amendments, criminal laws in this area are constitutionally limited to hard-core pornography. I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description; and perhaps I could never succeed in intelligibly doing so. But I know it when I see it, and the motion picture involved in this case is not that. ”
I like this statement and I’m going to borrow the learned Justice’s words and say, I won’t try to define for you today the differences in active voice and passive voice as I may not succeed in doing it intelligibly but I know it when I see it.