Re: 7X07 The Rings of Akhenaten (Grading/Discussion) (SPOILERS!)
We have Clara's belief, but that doesn't mean the Tardis doesn't like her. I guess this will be clarified further in the Journey to the Center of the Tardis episode.
We are quicksilver, a fleeting shadow, a distant sound... our home has no boundaries beyond which we cannot pass. We live in music, in a flash of color... we live on the wind and in the sparkle of a star!' Endora on witches in Bewitched