You've been buying into a lot of propaganda if you think humans know how to express their emotions, [ Harold answers dryly. It's sarcastic but still ultimately sincere. If Castiel is what he says he is, a non-human entity newly come to self-determined consciousness and struggling to understand his own motivations and expression of self, Harold thinks he should immediately lower his expectations. ]

It's a skill, same as anything else. Some of us are better at it than others. [ For a moment, he thinks ruefully of John and his almost total inability to engage in emotional conversation... ] Fortunately, that means it is also a skill that can be acquired.

[ He should know; it doesn't come naturally to him, either. ]