"Yes, you are," Sam said, without hesitating, without raising his voice. "You're real. And I don't like watching you..." He trailed off, at a loss for words. Wasting away wasn't accurate, though it might not be too far from the truth. "I don't want you to miss out on what your life in this world might have to offer."
His voice, if anything, was getting quieter. Not because he didn't believe in what he was saying, but because it hurt him, too. To try to push Cas in a direction that he knew would be painful and difficult for him, even though he knew it was for the best. And it hurt to want so much better for him, to want to see him come out the other side healed and strong and recovered, and to know that there was nothing he could do to make it happen if Cas wasn't going to do anything about it himself. "If there's any reason why you're not the real you, it's because you won't be. You want to be... fun, and relaxed, and hopeful, even when reality doesn't add up to it. Things are actually kind of crappy right now, Cas, and you're ignoring all of it. As if it's just going to go away if you pretend it isn't there, but it won't."