I’ll try not to bore my dozen readers by quoting from this book too much (pg 59):
The process of individuation is a process of inner growth to which one is attached; one cannot get away from it. If one says no to it and does not accept it, then, since you are not in it, it grows against you. If you refuse the growth, then it kills you, which means that if a person is completely infantile and has no other possibility, then not much will happen. But if the person has a greater personality within — that is, a possibility of growth — then a psychological disturbance will occur. That is why we always say that a neurosis is in a way a positive symptom. It shows that something wants to grow; it shows that that person is not right in his or her present state and if the growth is not accepted it grows against you, at your expense. The inner possibility of growth in a person is a dangerous thing because either you say yes to it and go ahead, or you are killed by it. There is no other choice. It is a destiny which has to be accepted.
— Marie-Louise von Franz, 1959.