In the later part of his authorship he more or less departs from the academic tradition and focuses on psychology, self-development and philosophy of consciousness seen in relationship to meditative instructions.
In 2009 he was co-author of an article published in the scientific journal NeuroReport: "Long-term meditation is associated with increased gray matter density in the brain stem".
[2] From 1978 to the early 1980s Bertelsen was in an ongoing training with the Irish healer Bob Moore, whose understanding of the human energy system had roots in the theosophical tradition.
[6] In several of his books, Bertelsen describes the unique possibilities and challenges inherent in the secularized Scandinavian societies for developing an experientially based spirituality.
In his view such an effort is to be based on "democratic understanding, openness toward the Christian cultural values, equality between men and women and a scientific approach".
[11] A similarly Christian faith-based criticism has been put forth since 2006 by Annette Leleur and Frank Robert Pedersen, both connected to Vækstcenteret until the early 1990s.