I'm not saying this is a good plan, but after all the carving and searching and obsessing; I'm pretty damn curious to see what all the fuss is about.

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.

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.

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.

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

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.

Coulson: I don't know how else to explain it but it needs to be carved.
Skye: Does it just appear in your mind like some sort of vision?
Coulson: No, it just kinda happens. Which is really frustrating because no matter how much I carve it still means nothing to me. I don't even have a theory.
Skye: I do. It's a map.

Skye: Hold on are you saying that I am an alien?
Coulson: It's a theory.
Skye: No a theory is what scientists use to prove things in nature. This is you telling me that I might be an alien. That is not something you just say like it's no big deal.
Coulson: I was trying not to rattle you.
Skye: Guess what? Epic fail.

Laser grids. Why is it always laser grids?

Fitz: Is there anything more?
Coulson: That I'm keeping from you? Yeah I'm Director, there's a hell of a lot more. But there is one other thing you should know. Simmons is on an assignment. That's why she hasn't been in contact. That's why she left.

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.