Tripp: Isn't that in the Bermuda Triangle? 'Cause that would explain a lot.
Coulson: Actually, it doesn't have anything to do with the triangle. We solved that back in the 80's.
Tripp: Ah Atlantis?
Coulson: Try Puerto Rico.
Skye: These white markers represent vertical airshafts that are close to the surface. Possible entry points for the city but most of them are under the ocean floor.
Coulson: Except for one, here, in Old San Juan where we'll enter the underground city. A survey team will test the tunnels structural integrity then locate the temple.
Simmons: And then what sir?
Coulson: We blow the hell out of it.

Christian: I don't understand, what do you want out of all this?
Grant: I want the truth about this one event from my past. Admit you made me push Thomas down the well.

Agent Carter: I've seen all of your home movies. The bodies left in your wake. The girl you caged up. There'll be no second chances for you.
Reinhardt: You must be dying to understand all those items you recovered. They're fascinating no?
Agent Carter: I don't suppose you'll tell me where they came from?
Reinhardt: There's a story, a myth from the east of stars that fell from the heavens. Of blue angels who came bearing a gift for all mankind meant to save the world.

Coulson: We may actually have a shot at finding the city.
Skye: Are you sure it's something you want to dig up?
Coulson: If we don't, HYDRA will. We need to get there first.

Discovery requires experimentation and this experiment will take time.

Whitehall

I was put in charge of the T.A.H.I.T.I. project so those people are my responsibility. If going back in this machine saves even one life, then it's worth the risk.

Coulson

Fitz: He'll recover, he did before. Besides brains never delete files they just lose connections, but there's always a back up. It's just a matter of digging and finding them.
Mack: So you've got back up files too?

Simmons: She had GH.325 in her blood.
Coulson: A T.A.H.I.T.I. patient?
Simmons: Whoever killed her also had GH.325 in their blood.

Skye: You two don't have a single thing in common unless you have some Enya albums you've been hiding.
Coulson: No, nothing in common at all.
Skye: I take that back.

May gave specific instructions, you go on a date with a crazy wall I have to chaperone.

Skye

Mack: Look I know you two have a past but from what I've seen the only thing that makes him worse is you.
Simmons: I know, why do you think I left?

Senator Ward: The American people are looking for a simple enemy Mr. Coulson. It's what makes them feel safe.
Coulson: And how do you think they'd feel if they knew your brother was HYDRA? That's an awfully complicated idea to grasp. Especially in an election year.
Senator Ward: Are you threatening me Mr. Coulson?
Coulson: No, I'm telling you I have your brother in my basement.

Agents of S.H.I.E.L.D. Quotes

Hill: Then New York was invaded by aliens, and they were beaten back by among others, a giant green monster, a costumed hero from the 40s, and a god.
Ward: I don't think Thor is technically a god
Hill: You haven't been near his arms.

Hill: What does S.H.I.E.L.D. stand for Agent Ward?
Ward: Strategic Homeland Intervention, Enforcement and Logistics Division.
Hill: And what does that mean to you?
Ward: That someone really wanted our initials to spell SHIELD.