"Sorry. The last time I looked like that without knowing it, Dr. Venkman had caught me thinking about Romana. She's... very important to me."

That's a simple enough place to start.

"And, yeah, you do... because if there's one thing I've been smacked over the head with again and again in my travels, it's that once a choice presents itself to you, you have to make it. Even if you turn aside from the possible alternatives and refuse to change anything one way or another, it's still choosing." He shrugs. "Sorry. I'm getting preachy and I don't mean to be."

He thinks for a bit. "I can't offer you as much of a basis as you probably need," he says, "but I can offer you something that may be of assistance."

"I can give you history. The books haven't been burned yet, where I come from..."