How about these?

"On your left." Hilarious in The Winter Soldier, bring-the-house-down emotionally exhilarating in Avengers Endgame.

Plus I've always had a soft spot for these two, both from Civil War:

“Compromise where you can. Where you can’t, don’t. Even if everyone is telling you that something wrong is something right. Even if the whole world is telling you to move, it is your duty to plant yourself like a tree, look them in the eye, and say ‘No, you move.’” (Sharon Carter, quoting Peggy)

“Vengeance has consumed you. It’s consuming them. I’m done letting it consume me.” (Black Panther)