I never wanted children, especially if they'd have to go through what Samantha and I had to go through. You're welcome to yours, but --

[ Mulder fights back the tears as best he can. ]

I didn't know what I wanted until I learned that I had it... and it went away.

[ He blanks out the rest of what the Doctor has to say. He misses his son, the son he only got to hold once in his life. It's not fair. He promises himself he won't cry, but he's breaking that promise, so he lets his eyes well up and refuses to visibly wipe the tears away. They can fall into his lap as they have to. ]