"It's difficult to stay hidden from me." It's not him being arrogant, it's the truth, especially with Cerebro. It's possible that a creature might not be someone he can read the mind of, but he would've heard through other people's minds if there were true bumps in the night. It would be comforting in a way if there were others, if it wasn't basically mutants against the rest, even if his dreams for peace are something he still strives for.

"Yes, our powers begin during puberty. Our genetic makeup is different from humanity, something I studied in laboratories and then in person." Charles has his doctorate in genetics and he's quite the nerd at heart, he loves science and discovery so deeply. Education just became the stronger passion in him once he found his fellow mutants.

"It's become part of evolution, growing in size and variation over the years. I'm told in our future there is a large population of mutants from what I know." It is humbling to know and also incredible. He didn't know of any of his kind until Cerebro, and he already did know it grew by the day, by the year, but the level he's heard of is more than he imagined.