James Taggert: " There are no absolutes—as Dr. Pritchett has proved irrefutably. Nothing is absolute. Everything is a matter of opinion. How do you know that that bridge hasn't collapsed? You only think it hasn't. How do you know that there's any bridge at all?"
But then that's just my opinion.
Whenever someone says to me, “There are no absolutes. You can never be 100% certain of anything,” I always respond by asking them, “Are you sure?”