I always disliked how Arya’s story at the temple of black and white went…

A girl speaks the truth!

Arya Stark facing Jaqen H’ghar once again, her sightless eyes searching the blackness, “who are you?” he asks. “I am no body” she replies; “a girl lies!” says Jaqen. “WHO are you?”; Arya angry now, stares blankly at him, “I am Arya of the house Stark! I am The Cat of the Canals! I am the boy Arry; I am the Blind Gir!; I am anybody!”. “Yessss” replies Jaqen “a girl speaks the truth”.

The realisation dawns; the Waif who tormented Arya for the longest time never realised this was the test; her vision clears. Jaqen H’ghar smiles down at Arya, you are anybody, you are everybody!

The Waif, realising that Arya has passed her tries to kill Arya. The Waif is not much of a challenge and Arya kills her in self defence. Jaqen is not pleased, Arya was not sanctioned to kill The Waif. She is forced to leave the temple…she returns to Westeros and the story continues from there.