Boyd's internal desire to avoid information of his future self was oddly comforting for Castiel, if only because he knew that it was going to be a continuous struggle for himself. Everyone was always so eager to remind him and yet he neither wanted nor needed any reminder. He was who he was. And that was who he was going to stay. If he could assist Boyd in that manner as well, then...he was willing to, but he knew he could only do so much.
"It's...not similar to a disease and you're not wrong," he explained simply. "If anything's wrong at all, it would be this reality. Until recently, I wasn't even aware of what a comic book was. Apparently this reality is populated with heroes similar to those depicted in them."
Facing Boyd completely, he took what the other man said into consideration very carefully. He admired the other man's outlook on the matter, considering the confused state his own faith had left him in. At that, he did smile, albeit so faintly that one who didn't know him wouldn't know how to look.
"And enduring is all we can do," he agreed. "We stay who we are now. What His will is...it is of very little import."