Only analysts who've experienced the infinite in their own life are effective.

"From the standpoint of modern depth psychology, [a] shamanic experience amounts to undergoing an invasion of the collective unconscious and dealing with it successfully. When the training analysis of a future analyst remains hung up in discussion of personal problems, in my experience, that person never turns out to be an effective analyst later on. Only when he has experienced the infinite in his own life, as Jung formulated it, has his life found a meaning. Otherwise it loses itself in superficialities. And, we might add, then such a person can only offer others something superficial: good advice, intellectual interpretations, well-meaning recommendations for normalization. It is important that the analyst dwell inwardly in what is essential; then he can lead the analysand to his own inner center. A shaman said aptly to a piece of wood which he wanted to turn into a drum: 'Make your mind free from quarrelsomeness and discord, larch, you’re going to become a drum.'"
Marie-Louise von Franz, Psychotherapy