Certainly a goal is to rid oneself of the ego 'I', and become more soul-like in nature. So if it doesn't speak occasionally, I guess we're getting nowhere. But it can 'speak' in a sense, to the ego-self, in the form of flashes of insight. Intuition and direct cognition are the languages of the soul. So this would remain silent within the individual, as the minute it comes out telling others, it is no longer from the soul, but from the ego-self, and this is often termed a spiritual ego ... and another reason why mystics are taught to keep quiet. It is a long road.