Gaius: Given the Sarrum’s reputation, are you certain it’s wise to seek an alliance?
Arthur: If we’re to achieve peace in the five kingdoms, we’ve got little choice. I don’t agree with his regime, Gaius, but dealing with him may be the only way of achieving our aims.
Gaius: You’re right, of course. You are becoming a true statesman, Arthur. I hope you realise that.

-Merlin: The Hollow Queen

Merlin: Have you noticed anything about Gwen of late?
Gaius: Nothing unusual. Why?
Merlin: I’m not sure exactly.
Gaius: Something she’s said? Something she’s done?
Merlin: No. It’s nothing in particular. It just seems to me that ever since she returned from the Dark Tower she hasn’t been quite herself.
Gaius: Well, is that so surprising? She lost her only brother. Elyan was all the family she had. And grief changes people, Merlin.
Merlin: I know that. I do, but…
Gaius: Besides, we can only guess at what Morgana put her through.
Merlin: That’s what worries me.

-Merlin: A Lesson in Vengeance

Queen Mab: You must beware, Emrys. The Tower is not a real place. It is the heart’s rest, the mind’s deepest fear, the stillness in the hummingbird’s eye.
Merlin: Stop talking in riddles.
Queen Mab: Then I shall talk in rhyme. Heed my words with due concern, for one of you will not return.

-Merlin: The Dark Tower

GAIUS

Sire, thank you for coming. Please.

ARTHUR

Tell me Merlin’s got you believing his nonsense too, Gaius.

GAIUS

This is a runemark, my lord.

ARTHUR

So everyone keeps telling me.

GAIUS

In times past, this mark aroused great fear. It was given to those found wanting by the court of the Disir.

MERLIN

The Disir?

GAIUS

The highest court of the Old Religion. Three women were chosen at birth to be trained as seers and soothsayers. Their only task was to interpret the word of the Triple Goddess. When they sat in judgement, their word was final.

ARTHUR

This worn-out superstition has no relevance now. I don’t see how what bearing it has on me or Camelot.

GAIUS

Because, sire, the Disir saw fit to give you this. This is the judgement of the gods against you.

ARTHUR

This is…nonsense, surely?

GAIUS

The Old Religion held that the runemark not only contained a man’s guilt but the path that the gods had chosen for him. That is why it is both a judgement and fate.

ARTHUR

I make my own path.

GAIUS

Do you? It is said that only the gods can alter a man’s fate… And even then, only when he repents and appeases them.

ARTHUR

You don’t believe any of this? Gaius?

GAIUS

I am an old man, sire. Old enough to be wary of dismissing other people’s beliefs.

-Merlin: The Desir

GAIUS Merlin!

MERLIN Gaius! Hilda is Morgana.

GAIUS Morgana?

MERLIN She’s been using some kind of aging spell.

GAIUS That explains why she’s always so tired.

MERLIN Mithian tried to warn me but I couldn’t get to Arthur in time. Morgana got to me first.

GAIUS And she very nearly killed you Merlin!

MERLIN Yes. Well, she didn’t count on the sorcery of your power, now did she?

GAIUS Indeed, but please Merlin don’t make me do that again. I’m not sure my heart can take it. 

GWAINE Merlin!

MERLIN We need to get to Arthur. He’s walking straight into a trap.

-Merlin: Another’s Sorrow

GAIUS The Horn of Cathbhadh. When Uther attacked the Isle of the Blessed, the Horn of Cathbhadh was smuggled to safety before the temple fell. It hasn’t been heard of since.

ARTHUR The old woman said it could be used to open the door to the spirit world?

GAIUS I have seen it with my own eyes. Long before the time of the Great Purge I took part in such ceremonies. each year at Beltain, the High Priestesses would gather at the Great Stones of Nemeton and summon the spirits of their ancestors. It holds powerful magic. You must keep it safe.

-Merlin: The Death Song of Uther Pendragon

Morgana: Aithusa… come. Come here. Don’t worry. We’re safe. No harm can come to us now. Our troubles are all in the past, I promise (Aithusa comes closer and rests her head on Morgana’s bed) Soon we will have the Diamair. Soon we will know Arthur’s Bane. Camelot will be ours.

-Merlin: Arthur’s Bane: Part Two

MERLIN
What happened to you? Who did this to your village?

LOCHRU
That it happened at all is all that matters. I have been haunted by this moment for many years… since long before you set foot on this Earth, Emrys, I have waited for its arrival with the sorrow in my heart. For even as Camelot flowers, so the seeds of her destruction are being sown. The prophets speak of Arthur’s bane. You would do well to fear it, for it stalks him like a ghost in the night. Unless you act quickly, Emrys, even you cannot alter the never-ending circle of his… fate.

[Lochru’s hand falls back to the water. Merlin then sees a vision in the water of Mordred walking to the injured Arthur. They cross swords, and then Mordred pierces his sword through Arthur’s body.]

-Merlin: Arthur’s Bane: Part One

MERLIN
Many years ago, before the birth of the five kingdoms, this land was in an endless cycle of bloodshed and war, but one man was determined to end all that. He gathered together the elders of each tribe and drew up plans for the lands to be divided. Each would respect the others’ boundaries, and drew it over the land as they saw fit. That man was Camelot’s first king, ancestor to all that followed, including you, Arthur.

ARTHUR
Bruta.

MERLIN
You know the story.

ARTHUR
Yes, ever child in Camelot does. Can I go back to bed now?

MERLIN
No. Because there’s another part of the story that you haven’t heard.

ARTHUR
Really?

MERLIN
When Bruta was on his deathbed, he asked to be taken deep into the forest. There, with the last of his strength, he thrust his sword into a rock. If his lineage was ever questioned, this would form a test. Only a true king of Camelot could pull the weapon free.

-Merlin: The Sword in the Stone: Part Two

Arthur: You knew Agravaine was betraying me.
Merlin: I couldn’t be sure… but I did have my suspicions.
Arthur: I feel like such a fool. I put such trust in him. All this time, I was blind to his treachery as I was to Morgana’s.
Merlin: You were deceived. It could happen to anyone.
Arthur: Yet it keeps happening to me. I cared about these people. I don’t understand. What have I done wrong? Why do they hate me?
Merlin: No, they don’t hate you, they just… crave your power for themselves.
Arthur: Perhaps. But would they still want that power if I was the King my people deserve? Maybe Tristan was right.
Merlin: Tristan was angry and… afraid. He needed to blame someone but it’s not you that’s to blame.
Arthur: You seem very sure about all this.
Merlin: All I know is that for all your many faults, you are honest and brave and true-hearted. And one day you will be the greatest King this land has ever known.
Arthur: Well… good to know I have the support of my servant, at least.
Merlin: I’m not alone. Believe me.

-Merlin: The Sword in the Stone: Part One