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Loneliness (孤独, Kodoku) is episode 58 of the Naruto: Shippūden anime.

Synopsis

The temple monks explain that the tombs hold the loyal bodyguards of the Fire Daimyō. Naruto observes Sora sparring with other monks and becomes offended upon realising he is holding back. Naruto challenges Sora, but just as the matter is about to get serious, another monk stops him. Naruto realises Sora is despised by the other monks as he was himself and wishes to befriend him. Naruto visits Sora again and observes him practising his wind technique in earnest, hoping to get strong enough to avenge his father. They later return to the temple to receive news that another tomb has been robbed.