It was the murmuring of nature. Nature tells something on the creative levels of experience. The shaman, priest, or visionary knows what nature tells him or her, but again, cannot translate it exactly into words of everyday usage. This murmuring is more like the conveying of creative ideas. Neither action nor feelings of this murmuring can be defined in words of language.
Language is too well-defined for such communication.
The Runes have always been perceived as sacred symbols rather than as an alphabet. In fact, several sounds of the ancient Viking language are not even represented in the Runic alphabet. This fact by itself rendered the writing of language in Runic symbols to being a rather clumsy affair. Runes represent energies from the realms of creation. Because of this characteristic, Runes are well suited for the making of very powerful talismans as well as for other powerful magical practices.