Owing to the fact that humans are embedded in a historical context, and owing to the fact that each context has its own unique political, economic, social, and psychological parameters which provide a unique experience, "paths" (i.e. the teachings, concepts, and practices supportive of Connection) are always historically specific. An ancient path taught by even the most talented of avatars is, arguably, ineffective and (often) counterproductive in the context of modern sensibilities and realities.
Sosteric, Mike. (SOA). The Science of Ascension: A Neurologically Grounded, Spiritually Sophisticated Theory of Mystical/Spiritual Experience. Unpublished. 
Sosteric, Mike. (RSGAS). The Rocket Scientists' Guide to Authentic Spirituality. St. Albert, Alberta: Lightning Path Press.