"The saint is alone with God in the midst of vulgar men, just as mercury and gold are united amidst the wastes of the earth." (L. Cattiaux, The Message Rediscovered 3, 72)

"In plain terms, it is the middle substance of the wise men's Mercury, a water that is coagulable and may be hardened by a proper heat into stones and metals" (T. Vaughan, Aula Lucis )

"I am called of the philosophers Mercury ; my husband is gold philosophical. I am the old dragon that is present everywhere on the face of the Herat . I am father and mother, youthful and ancient, weak and yet most string, life and death, visible and invisible, hard and soft, descending to the earth and ascending to the heavens, most high and most low, light and heavy. In me the order of Nature is oftentimes inverted, in colour, number, weight, and measure. I have in me the light of Nature; I am dark and bright; I spring from the earth and I come out of heaven" (B. Valentin, The Azoth of the philosophers)

"For he is said to have been called Mercurius , that is, medius currens ('he who runs in the middle") because, it is said that the word runs in the middle of men, they say also that the Greeks call him Hermes, because the interpretation, which certainly belongs to word, is called by them hermeneia " (St. Augustine, The city of God)

"So when the crowds saw what Paul had done, they shouted in the Lycaonian language: "The gods have come down to us in human form!" And they called Barnabas, Jupiter; and Paul, Mercurius, because he was the chief speaker". ( Acts 14, 11-12)