Kyôjô kessen! Zabuza futatabi!! Naruto : Season 3 Episode 12

While Naruto concentrates on the training to control his chakra, a mysterious person suddenly appears before him. The person tells Naruto that as long as one has the desire to protect what he loves, there is no limit to becoming stronger. The mysterious figure echoes the sentiment inside Naruto and the two feel a sense of connection.