The Arabic alchemist Umail at-Tamimi (c. 900-960), known as Senior Zadith, entering the "Treasure-house of Wisdom", the lapis. The four gates of the four elements must all simultaneously "be opened with four keys until the whole house is filled with light."

Aurora consurgens, late 14th century. Roob, The Hermetic Museum, p. 350

When a human being succeeds in making contact with his “perfected nature,” it reveals to him all the hidden secrets and becomes a spiritual guide to the initiate, “opening the bolts of wisdom and conveying to him the keys to the gates, in dreams and in waking state.”

Gershom Scholem, On the Mystical Shape of the Godhead, Schocken Books, New York, 1991,  p.255.