As much talk as Strange was, he had humbled since learning from the Ancient One and taking over the protector of the New York Sanctum. Not too humble, but enough to where he could hold a conversation with most. Christine had seen the change in him before he had to leave her behind. Perhaps that was exactly what he had needed to finally find a sense of balance.
He also knew not to go waving his mystical abilities about to draw attention. They worked behind the scenes and through dimensions. It wasn't so bad even if it took Strange out of the spotlight he so use to standing in.
"What most consider impossible is relatively possible if you maintain an open mind." That had been a difficult thing for him to grasp at first. Creating magic from energies unseen? Of course, it would be difficult for someone to believe. "Do you think you can make the impossible happen"?