Non-Duality says the experience of separation is illusory. Therefore, trying to overcome it, is just furthering the misunderstanding. All justification for spiritual teachings and teachers is based on this misunderstanding.
Spiritual teachings and teachers function within the belief, knowledge or experience, that there is a lack, something missing in the student, that can be rectified through becoming better or learning something new. Spiritual teaching comes from the perspective, that separation — the subject-object experience — is real and can be or even should be overcome. The overcoming of the separation has the goal of becoming a better person or even the so-called personal enlightenment. http://www.simply-this.com