In Kingdom Hearts Chain of Memories, Riku is forced to deal with the darkness inside him, as Ansem demands to control him through darkness. Throughout the game, Riku is asked the same questions: "Will you go toward light? Or will you give in to the darkness?"
One of Riku's best lines in the whole game, in my opinion, is in Kingdom Hearts 3D Dream Drop Distance, where he is once again questioned about light and darkness. He made this decision when Diz stood at the crossroads and told Riku to choose between light and darkness. Riku came up with his own answer, and learned to accept both light and darkness. His choice is more than a choice of magic. Riku chose to accept the past and look toward the future. He has decided to use what he has in order to get to where he wants to be. His quote is a powerful statement that confirms he is in balance and he won't be pressured by darkness anymore. Riku's quote is both powerful and hopeful. His decision is brave and his alone.