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.
If you do,
Lord Orochimaru will give you power.
إن فعلت فسيمنحك أوروتشيمارو-ساما القوة
Si lo haces, el señor 
Orochimaru te dará el poder.
Si lo haces, Orochimaru-sama te hará muy poderoso.
il nobile Orochimaru 
ti renderà più forte.
Se vier, o senhor Orochimaru lhe dará poder.