A spiritual mentor’s role is unique in that the goal is not to transmit knowledge or understanding as much as it is to somehow bring about a recognition in the student of the student’s own pre-existing nature. This is a much more subtle thing than simply teaching someone a skill or understanding.
It is not that a spiritual teacher never provides spiritual teachings or knowledge or understanding, but that knowledge or understanding by itself is not the goal. A student can have a broad knowledge of spiritual principles, and yet can still not have truly recognized those principles as being inherent in his or her own being.
So spiritual teachers or mentors may teach a lot or they may not teach anything, depending on what the student needs in that moment to experience this deeper recognition of their own true nature.