All phenomena are threefold; there is no physical oneness. All physical manifestations, even those apparently single and individual in nature, have a threefold origin; otherwise, manifestation could not occur. This basic trinity is represented by the Philosophical Sulphur, Salt and Mercury, always constituting apparent oneness. Duality, negative and positive, is merely an individual concept to describe physical manifestation. From concepts such as this, based on physical phenomena, conclusions are formed. Since physical actualities are not absolute realities, but change due to constant atomic rearrangement, the conclusions formed constitute only a hypothesis based on physical experience, and do not represent an absolute reality. Therefore, that which IS, exists because of its own consciousness. That which IS embraces all that we can experience consciously or subconsciously. To think of that which IS as dual is only an individual concept based on physical manifestation. A thing that IS may be interpreted as perfectly good by one person and horribly evil by another, both interpretations being applied to the same entity that IS. In reality, it cannot be both, but only one. This absolute one, or as Kant has called it, the thing-in-itself ("Das Ding an Sich"), constitutes consciousness of itself inherent in every cell or whatever consciousness makes itself manifest. Every duality has its origin in one cosmic consciousness. Here again it is the alchemist who diligently advocates this vital principle of the oneness of all things.

From the Alchemist's Handbok by Frater Albertus