Iris: He's a murderer.
Barry: I know he's a murderer. But how many murderers have we put in prison? How many bad guys have we taken down? Don't we deserve one win? After everything that we've done?
Iris: Life doesn't keep score, Barry.

Abra Kadabra: If you let me go, I will tell you Savitar's greatest secret. It's the key to defeating him. The key to stopping him.
Barry: What secret?
Abra Kadabra: I know who he is. I know his name.

Can you please stitch me up? Because I think I need to pass out.

Caitlin

I was so focused on not hurting you as Killer Frost that I forgot I could hurt you as Caitlin Snow. And for that, I'm very sorry. So I understand if you don't trust me anymore, but maybe you can find it in your heart to forgive me.

Caitlin

You're going to die for all the things you've done. I cannot wait to see you be put to death.

Gypsy

Cisco: It looks like things between you and Julian are a little [pauses for effect] frosty.
Caitlin: [gives him a dirty look]
Cisco: It's too soon for the cold puns, huh?

Barry [singing]: I'm your super friend. Your super friend. I'll be there in the nick of time if you're ever in a spot.
Kara [singing]: And if not there in time, you can just go back in time and give it another shot!
Barry: I'm actually not supposed to do that anymore.

Music Meister: You're in a movie musical. All you have to do is just follow the--
Kara: [excited] The yellow brick road?
Music Meister: No. The script.

Cisco [to Wally]: We win and we lose as a team. I'm coming with you.
J'onn: Me too.
Cisco: Look, J'onn. I respect this whole special agent situation you've got going on. But this problem right here needs someone with...
J'onn: [transforms to his Martian form]
Cisco: ...green skin and a sick ass cape.
J'onn: Call me the Martian Manhunter.
Mon-El: I think you'll find that J'onn's a lot more than just a pretty face.

Man, how did you get out of that cell?

Cisco

Love will find a way. You can do it! Power of love and all that.

Music Meister

Barry: Dads?!
Joe and Stein: You got a problem with that?

The Flash Quotes

One mystery I cannot figure out is why some people come into our lives and why some people go. Others become a part of you. Some friendships feel like they'll last forever and others end far too soon. Not every friendship is meant to last forever. What does last forever is the pain when that person is gone.

Barry

You can do this, Barry. You were right. I am responsible for all of this. So many people
were hurt and when I looked at you all I saw was another potential victim of my hubris, but you, Barry, you can stop it. You can do this. Now RUN BARRY, RUN!

Harrison