Shamanism is an ancient healing tradition and moreover, a way of life. 

It is a way to connect with nature and all of creation. Historically, shamanic healing has been practiced by indigenous people for as long as humans can remember. The shaman works with the knowledge that all things are connected and have life force energy, or spirit, within themselves.

When someone or something becomes diseased or out of balance, the shaman believes this is from a loss of life force energy or a disruption in energetic patterns. The core concept of shamanism is connecting with the spirit world and working with the Earth and life force energy in order to receive healing.

Knowledge isn't the acquisition and the insight of new but the experience of depth. It is the personal experience on a cellular, mental level.

Tom Cowan (from "Shamans of Avalon")