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 want to fight, just know
that I won't go easy on you.
إذا أردتم القتال فاعلموا أنّني لن أتساهل معكم
Wenn ihr also kämpfen wollt,
dann nehme ich keinerlei Rücksicht.
Si quieren pelear, les advierto 
que no tendré compasión.
Si queréis pelea, os advierto
de que no tendré compasión.
Se avete intenzione di combattere,
non ci andrò leggero.
Se quiserem lutar, não vou
 facilitar as coisas para vocês.
В драке поддаваться не буду.