The book 'The Sacred Science' is a Scientific treatise on Alchemy, like a sequel and companion of Volume 'The Forgotten Science'. The idea of these two books is to resurrect the Sacred Science ... that is a Science but is Sacred and lead to a full Multidimensional access for a clear understanding of what Sciences are (Mathematics, Physics, Chemistry, Astronomy, Biology) and the Golden key necessary to open the Door ... from the Doer, which is God and the 'I AM Presence' of each one of us.