There is a teaching principle in every man which can provide him with whatever spiritual knowledge he needs. But he must first take suitable measures to evoke it. These include cleansing of body and mind, aspiration of feeling and thought, silencing of intellect and ego.
If his mind is filled with other people's teachings, it may give no attention to his own Overself's teachings, leadings, and intuitions.
Although it is quite true that each quester must travel the path for himself, must move on his own two feet, this does not mean that he is travelling completely alone, or on his own. If he has no personal guide to accompany him, the Higher Self is still there, within him, pulling, drawing, leading, or pointing, if only he can learn how to recognize it.