"Evil never ends, it evolves. And friendship is always stronger than fear"
—Promotional tagline from season 2
"Our show is an anthem for the marginalized and imperfect, precisely because the Duffer brothers know from experience that character, grit, connection, and soul are bred in the same moments that challenge us most." "Mornings are for coffee and contemplation."
— Jim Hopper, "The Vanishing of Will Byers"
"Science is neat, but I'm afraid it's not very forgiving."
— Mr. Clarke, "The Flea and the Acrobat"
"Friends don't lie."
— Eleven, "The Bathtub"
"Something is coming. Something hungry for blood."
—Mike Wheeler, "The Vanishing of Will Byers"
"If anyone asks where I am, I've left the country!"
—Mike Wheeler, "The Bathtub"
"He likes it cold."
—Will Byers, "Will the Wise"
"He can't hear you. You shouldn't have looked for me. Because now I see you. Now we can all see you. You let us in. And now, you are going to have to let us stay. Don't you see? All this time, we've been building it! We've been building it for you. All that work. All that pain. All of it for you. And now it's time. Time to end it. And we're going to end you. And when you are gone, we are going to end your friends. And then we are going to end... everyone."
—The Mind Flayer speaking through Billy, "E Pluribus Unum"
"Feelings. Jesus. The truth is, for so long, I'd forgotten what those even were. I've been stuck in one place - in a cave, you might say. A deep dark cave. And then, I left some Eggos out in the woods and you came into my life and... for the first time in a long time, I started to feel things again. I started to feel happy. But lately, I guess I've been feeling... distant from you. Like you're pulling away from me or something. I miss playing board games every night, making triple-decker Eggo extravaganzas at sunrise, watching westerns together before we doze off. But I know you're getting older, growing, changing. And I guess... if I'm being really honest, that's what scares me. I don't want things to change. So I think maybe that's why I came here, to try to maybe... stop that change. To turn back the clock. To make things go back to how they were. But I know that's naive. It's just... not how life works. It's moving. Always moving whether you like it or not. And yeah, sometimes it's painful. Sometimes it's sad. And sometimes... it's surprising. Happy. So you know what? Keep on growing up, kid. Don't let me stop you. Make mistakes, learn from 'em, and when life hurts you - because it will - remember the hurt. The hurt is good. It means you're out of that cave. But, please, if you don't mind, for the sake of your poor old dad, keep the door open three inches."
— Hopper's letter to Eleven regarding her relationship with Mike, read by her after Hopper seemingly perished in the lab, in the Epilogue.