Stein and Eddie in “Unfinished Business”

Stein

We're dealing with a lot of big scientific ideas today. But you, Mr. Thawne, might be the most interesting thing here at S.T.A.R. Labs.

Eddie

Me?

Stein

What are the odds that Dr. Wells would travel back in time and get stuck in the exact same city as his great-great-great-great grandfather? Working in the same profession, the same building? And that part of his plan to get home would mean that he'd have to preserve and protect your life. That makes you this rare thing that no scientist can plan for.

Eddie

Which is?

Stein

Coincidence. There is no science to coincidence. You, sir, are an anomaly. A wild card, as it were. You are the only person in this whole story who gets to choose his own future. At least, that's my opinion.