[Cloud tenses as Sephiroth talks about wanting to be 'stronger'. There's so many meanings to the word, and given the context they're discussing he can't be sure if Sephiroth is comparing himself more to his past or to his potential future.]

Levy's right. And that Other You was incredibly strong, but he wasn't the same you we all know now. Hey may have seemed confident in his purpose, but the Other Cloud didn't think so. He saw him as a walking ghost shackled to his past and his misguided sense of his destiny.

[He narrows his eyes, brow furrowing as he leans forward.]

You're better than him, no matter how much 'stronger' he seems. You're still able to make your own choices of what you want to be, but if you become Him you'll lose that.