O be wise...

Bear was playing Chess on the laptop against the computer when he exclaimed in complete surprise:

"He didn't take my pawn!"

(he of course, meaning the computer)

Me:"Who didn't?"

Bear: "The computer. He could've taken my pawn BUT he didn't!" (apparently incredulous)

Me: "Well, just because you can do something, doesn't mean you should. Just because you can do something, doesn't mean it's always wise to. For instance, just because we can eat something, doesn't mean that it is wise to do so. Poison can be eaten. We can eat poison - but then it will kill us! Should we eat poison just because it can be eaten?"

Bear:"NO!" (emphatically)

Me: So just because we can do something, doesn't mean we should, see?"