Sigurd: I do not want to follow you, Ivar. You're crazy! You have the mind of a child.
Ivar: And all you do is play music, Sigurd!

Bjorn: I'm sorry to hear of Helga's death. We knew each other a long time. Since I was a boy.
Floki: I too am dead, Bjorn. A part of me died with my daughter, Angrboda, a second part with Ragnar, and the last part of what was Floki died with my sweet, sad Helga. What I am now is nothing. And all this nothing I give to the gods to do with as they please. And I shall be an empty ship with no rudder set upon their endless sea. And where they take me, I shall go.

Ivar: My opinion is that we should take the land. But I have one condition, that Ecbert dies, and that I Blood Eagle him. Otherwise, there is no deal.
Bjorn: You wouldn't be able to stand up long enough to Blood Eagle him.
Ivar: I imagine me sitting.

You are not like anybody else. Be yourself, Floki. This world, it is too small for you.

Helga

Floki: What are they doing? Where are they going?
Ivar: To Repton, I imagine.
Floki: To the boats? They are going for our boats? Oh, you crippled bastard! You were right! You were right! Oh, you bloody, mad genius. You were right!

Ivar: Listen, come with me, Bjorn. Let's investigate the battlefield. Perhaps, instead of a narrow and small place, we should stretch the battlefield across a large area, many miles. And use the landscape. Ditches, hills, woods. What do you say?
Bjorn: If it works, it is a good plan. If it doesn't, then it is a bad plan.

Egil's wife: Just tell them Egil!
Egil: If I do it it is for you, not for me. I am dead anyway. Perhaps they will spare you. I was paid by King Harald Finehair.

So this is what the grunting of the little pigs was all about?

Floki

Aethelwulf: You're not behaving like a king anymore. People are already talking about it. You're distracted, you're withdrawn, you seem unsure, hesitant. Once you were firm, you were strong.
Ecbert: No, I am filled with doubts, and I have begun to believe that being firm and strong was the illusion, and that I am unsure now because it is the most honest way to be.
Aethewulf: Not in the face of a great heathen army that have come to destroy us.

We are all equally Ragnar's sons, but we are not equal in battle. So I will take the lead. I will establish the battle plans, and I will give the orders. Do you understand that?

Bjorn

I've been told your god is a carpenter. And guess what? So am I.

Floki

Helga: What happened to you?
Floki: I wish I could say.
Helga: Why don't you try?
Floki: I don't want to be imprecise.
Helga: It's not a riddle.
Floki: No, it's a truth. I just don't know what the truth is.

Vikings Season 4 Quotes

Einar: There Earl Kalf, you have your answer.
Kalf: And here right now is mine... archers!
Lagertha: I should have done this a long time ago, Einar.

Bjorn: Floki needed to be dealt with. You were incapacitated, I thought it was the right thing to do.
Ragnar: Did you also think that if I wanted him arrested, I would have done it a long time ago? But now you have made it public, and left me with no options.