According to Paracelsus, "the sumum of theological and philosophical truths is contained in the religion of the two lights, the light of grace and the light of nature". We have wanted to follow the lessons of this Renaissance genius, and to order the principles, the grace or mystic and the nature or chemistry.

From two symbolic sets, that will be able to be extended and amplified to other significant fields of meaning, an effort has been made to create a base of theoretical references with respects to the traditional symbols. When choosing the fragments, we have looked for ways of providing an hermetic and symbolic basis without forgetting the texts of the western traditions as well as a text selection of other traditions, many of them proceeding from a summa of the universal wisdom elaborated by W. Perry (A Treasury of Traditional Wisdom). Because there is no way of understanding symbols without submerging oneself in the original sources of the tradition.