Part of Lea was tempted to just point at Roxas and Isa and say 'what they said', because he felt they had stated the important points better than he himself could. But at the same time he knew how much his opinion meant to Xion and so opted to make his best effort.
"Roxas is right," Lea said. "The fact that you were able to be kept safe inside Sora's heart and help keep his safe in turn is proof that you had one all along, whether you know it or not. Whether you want to admit it or not. Sora's heart is strong enough that it would have just overwhelmed you otherwise. You've got a good, strong, caring heart all your own. And the fact that you can care about us and be afraid of losing us is even more proof that it's there."
"And Isa's right too," he said. "Having or regaining your heart doesn't change who you are. But it does make you able to see things more clearly, to really care about someone besides yourself, and to feel regret and remorse for causing harm. I got lucky; I met Sora and had you and Roxas with me to help reinforce that. Isa... didn't. All he had was Xemnas and Xehanort whispering in his ear and dragging him down."
"Nothing made him change anymore than anything made me change," he said. "I decided to leave the Organization to try and restore Roxas. I decided to help Sora even though I knew what it would cost me. And after I became Lea again, I decided to fight on the side of the light. Not because suddenly having a heart again made me a different person, but because I was finally able to regret how much harm I'd caused as Axel and wanted to make amends."
"And also? Even if none of that was true, even then you still wouldn't have reason to worry about having a heart just because Isa seems different than the Siax you remember. Because really, you and him? Totally different situations. You're a Replica that Vexen created, and you gained a Heart from scratch. You didn't having any baggage to bring along from before you lost your heart like Isa and I did because you never lost it. So it's a little like comparing apples to oranges. The only thing your situations have in common is that you were friends with me and you both gained hearts. Nothing else. So there's no actual reason to think that gaining a heart would change you like you think it changed him. It's just not the same process. Got it memorized?"
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"Roxas is right," Lea said. "The fact that you were able to be kept safe inside Sora's heart and help keep his safe in turn is proof that you had one all along, whether you know it or not. Whether you want to admit it or not. Sora's heart is strong enough that it would have just overwhelmed you otherwise. You've got a good, strong, caring heart all your own. And the fact that you can care about us and be afraid of losing us is even more proof that it's there."
"And Isa's right too," he said. "Having or regaining your heart doesn't change who you are. But it does make you able to see things more clearly, to really care about someone besides yourself, and to feel regret and remorse for causing harm. I got lucky; I met Sora and had you and Roxas with me to help reinforce that. Isa... didn't. All he had was Xemnas and Xehanort whispering in his ear and dragging him down."
"Nothing made him change anymore than anything made me change," he said. "I decided to leave the Organization to try and restore Roxas. I decided to help Sora even though I knew what it would cost me. And after I became Lea again, I decided to fight on the side of the light. Not because suddenly having a heart again made me a different person, but because I was finally able to regret how much harm I'd caused as Axel and wanted to make amends."
"And also? Even if none of that was true, even then you still wouldn't have reason to worry about having a heart just because Isa seems different than the Siax you remember. Because really, you and him? Totally different situations. You're a Replica that Vexen created, and you gained a Heart from scratch. You didn't having any baggage to bring along from before you lost your heart like Isa and I did because you never lost it. So it's a little like comparing apples to oranges. The only thing your situations have in common is that you were friends with me and you both gained hearts. Nothing else. So there's no actual reason to think that gaining a heart would change you like you think it changed him. It's just not the same process. Got it memorized?"