Thus Ráma spake: Sugríva heard, And mighty joy his bosom stirred: As thus his champion he addressed: “Now by thy favour, first and best Of heroes, shall thy friend obtain His realm and darling wife again Recovered from the foe.

In plain words: Sugriva is filled with joy at Rama's words. He thanks Rama, saying that with his help he will get back his kingdom and his beloved wife.