Ansem the Wise: Perhaps I wanted to atone for events of the past, even if no apology can undo the harm I have wrought. I felt...that I ought to leave at least something behind. So I digitized myself and my research, and hid them within Sora.
Riku: So this is...data?
Ansem the Wise: Yes. A clue, I hope, to finding yourselves or your lost friends in your hour of need. The heart has always been quick to grow. Each exposure to light, to the natural world, to other people, shapes this most malleable part inside of us. Nobodies are not different from us in that manner. Sora was the only one able to return to his human form without destroying his Nobody. That is a statement to the love in his heart for other people, and the bonds that tie them together. Perhaps...he has the power to bring back the hearts and existences of those connected to him--to recreate people we thought were lost to us forever. Our most precious treasures--even an empty puppet--the trees of the forest, and the petals on the wind--there are hearts around us everywhere we look. And it does not take superhuman powers to see them. Surely we remember as children the way our hearts made everything seem so shiny, and perfect. Sora has a heart like that--uncorrupted, willing to see the good before the bad. When he sees the heart in something, it then becomes real. When a connection seems broken, he may have the power to mend it. He has touched countless hearts, he has accepted them, and he has saved them. And some of those hearts have never left him--whether they fell into darkness or were trapped there--whether they sleep in the darkness of Sora's heart, or were welcomed into its warmth--they can be saved. All Sora needs to do is be himself and follow wherever it is that his heart takes him. It is the best and the only way. The rest is in there.