When does one find the final spiritual teacher?

Following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Question: I have observed that the mind gets coloured with the subject that I get myself involved into. Firstly it was Osho, Krishnamurti, Adi Shankaracharya, Rumi, and Ashtavkara. And now the subject is you (referring to Acharya Prashant).