The King of Pirates

Gold Roger, "The King of Pirates", had achieved it all, wealth, fame, and power had all been his. Not surprisingly, the final words he spoke before they lopped off his head inspired adventurer throughout the world to sail the seas...
~From One Piece Chapter 1, Romance Down

I only have one father...

Portgas D. Ace: I have only one father... and that father is Whitebeard..!!!
~From One Piece Chapter 525, "The Undersea Goal, Impel Down"

The Undersea Goal, Impel Down

Portgas D. Ace: It doesn't matter whether... we know it or not... the fact remains that both Luffy and I... have the blood of a global-scale criminal flowing through our veins... how could we possible become marines....?

~ From One Piece Chapter 525, "The Undersea Goal, Impel Down"

Seconds of Courage

Coby: That's enough!! Stop Already! All this fighting, just end it!! We're throwing people's lives away! Even though every single soldier has a family waiting for them to return! Even though we've already accomplished our goal! We keep chasing pirates who don't want to fight, drawing out battles that should already be over... and abandoning soldier who could be saved if we treat their wounds now! And still, we're sacrificing even more people! What about the soldier who will fall after this?! We're making them look like idiots!

~From One Piece, Chapter 579, Seconds of Courage

Weatheria

Sky Island, Weatheria

Shanks: Do me a favor, keep this hat safe for me... this hat means a lot to me? Promise me that you'll bring it back to me someday!! When you've become a great pirate...

Luffy: I want to be the pirate king!!!
Coby: What? "Pirate King" was someone who has had everything in the world!!!

~From One Piece Chapter 2