Sherlock - Season 4 Prequel

"You may, however, rest assured there are no ghosts in this world. Save those we make for ourselves."

DI Lestrade: "I thought you understood everything."
Sherlock Holmes: "Of course not, that would be an appalling waste of brain space. I specialize."

Sherlock: "Moriarty's dead!"
Moriarty: "Not in your mind. I'll never be dead there. You once called your brain a hard drive. Well, say hello to the virus."

"Every great cause has martyrs. Every war has suicide missions and make no mistake, this is war. One half of the human race at war with the other. The invisible army hovering at our elbow, tending to our homes, raising our children. Ignored, patronised, disregarded. Not allowed so much as a vote. But an army nonetheless, ready to rise up in the best of causes. To put right an injustice as old as humanity itself. So you see, Watson, Mycroft was right. This is a war we must lose."

Watson: "I'm taking Mary home."
Mary: "You're what?"
Watson: "Mary's taking me home."
Mary: "Better."

Sherlock Holmes: "Your wife can see worlds where no-one else can see anything of value whatsoever."
Sir Eustace Carmichael: "Can she really? And how do you 'deduce' that, Mr. Holmes?"
Sherlock Holmes: "She married you. I assume she was capable of finding a reason."

Mycroft: "I have access to the top level of the MI5 archive."
Mary Morstan: "Yep, that's where I'm looking."
Mycroft: "What do you think of MI5 security?"
Mary Morstan: "I think it would be a good idea."

Sherlock: "I saw you die. Why aren't you dead?"
Moriarty: "Because it's not the fall that kills you, Sherlock. Of all people, you should know that. It's not the fall, it's never the fall. It's the landing!"