Not only is the teacher helpful in pointing out the proper path to be followed and also in exposing the errors of the disciple but furthermore in bestowing upon him an impetus to the practice of meditation and the strength to obtain the concentration required for it. The impetus is needed because through long habit engendered over many reincarnations of the past, most people are unbalanced. That is, they are either too extroverted and overactive with outward matters or live in a state of continual mental restlessness through being too busy with their own thoughts. The strength is needed because keeping the attention along a single track and sustaining it for a certain period is an extremely difficult task. Once the inner contact has been properly established, quite often the mere thought of the master will be enough to inspire the disciple and thus give him both the impetus and the strength required to make his attempts at meditation more effectual.
-- Notebooks Category 1: Overview of the Quest > Chapter 6: Student-Teacher > # 42