A leopard can't/doesn't change its spots. something that you say which means that a person's character, especially if it is bad, will not change, even if they pretend it has
Agree, it's idiom, but you're incorrect; people change/adapt/adjust/arise, and the fundamental character can change too. Regardless, righteousness is what we want, and that's what we have in Neubauer. He's a fine Christian man in actuality.