There is no meaning in having faith in the master only after he has performed certain miracles. Real faith and love are independent experiences which one develops even before knowing a person.
Faith is the first and foremost condition. God-realization is an outcome of intense and unflinching and non-dual faith. Faith does not demand any proof or epistemological conclusions. Faith is that intuitive attitude which one cultivates inwardly even before one comes across an object or a person.