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This is a very difficult question since Kingdom Hearts has way too  many outstanding quotes, with my favorite being by Axel, “If you have a dream don’t wait. Act.”

Though my favorite quote is an exchange between Sora and Kairi, where they say: “Kairi! Remember what you said before? I’m always with you too. I’ll come back to you… I promise!” and Kairi says, “I know you will!”

I love this quote because it shows Kairi’s faith. While she is being “removed” she doesn’t know what will happen but still knows that Sora will always be there for her, no matter what.
Make you want something like this.

Another would be when Sora was about to fight Riku for the first time in Kingdom Hearts 1 and said:
“I don’t need no weapon, my friends are my power”

Some smaller ones are: Roxas: “I hate you so much.” DiZ: “You should share some of that hatred with Sora. He’s far too nice for his own good.”
“A-yuhk” by Goofy and Seifer: “It was undeniable proof that we totally owned you lamers.”
All for funny reasons.

Again, difficult question seeing as how there are ALOT of games! But I hope I answered your question!
(: