Called Doctor Mirabilis (Latin for "astounding teacher"), there doesn't seem to be an area of science or philosophy this amazing man did not explore. Here is a fine example of Bacon's esoteric thinking. A great read.
The bodies of all natural things being as well perfect as imperfect from the original of time, and compounded of a quaternity of elements or natures, viz., fire, air, earth, water, are conjoined by God Almighty in a perfect unity. In these four elements is hid the secret of the philosophers.