Sasuke’s defeat to Gaara, and later Itachi, forces him to realize that he is not strong enough to get revenge against his older brother.
to think that you would
teach Naruto the Rasengan.
لا أصدّق أنّك تعلّم ناروتو الراسينغان
wer hätte gedacht, dass du Naruto
das Rasengan beibringen würdest.
el haberle enseñado el rasengan a Naruto,
el haberle enseñado el rasengan a Naruto,
non avreste dovuto insegnare 
quella tecnica a Naruto.
quem diria que você ensinaria
 o Rasengan ao Naruto.
учить Наруто
Расенгану — не лучшая идея.