Star Trek: Deep Space Nine1993

Dr. Mora:
[about Odo] I never thought he could do it - integrate successfully. If you could have seen him before. He was so ill-prepared to be on his own, I was sure he'd come back. I told him when he left, he'd come back. And all these years I was so certain that eventually, one day he'd show up at the lab... Well, I guess I'd better get used to the idea he's not going to.