if there isn’t a them, there can’t be an us.

I don't really understand this. When you have so many people, each one inevitably fascinating, why would you limit yourself to only those like you?

She shrugged. "You can be happy for someone else's good fortune, but that doesn't mean you forget your own bad luck.

If you're afraid of everyone leaving you, what do you do?"
Make them stay."
And if you can't do that, or don't know how to?"
Ellie shrugged. "I don't know."
Yes, you do. In fact, you've done it. You leave first," Coop said, "so you don't have to watch them walk away.

I wonder if you've got a minute."
I have many minutes, all of them used toward a common purpose.

I wonder if it's putting on someone else's skin for a while that she likes so much, or if it's the option of being able to send back a circumstance that just doesn't suit you.