The phrase "scientia potentia est" (or "scientia est potentia" or also "scientia potestas est") is a Latin aphorism meaning "knowledge is power", commonly attributed to Sir Francis Bacon. The expression "ipsa scientia potestas est" ('knowledge itself is power') occurs in Bacon's Meditationes Sacrae (1597). The exact phrase "scientia potentia est" (knowledge is power) was written for the first time in the 1668 version of Leviathan by Thomas Hobbes, who was a secretary to Bacon as a young man. The related phrase "sapientia est potentia" is often translated as "wisdom is power". In the modern and contemporary inquiries of the proposition, Stephen Gill furthered Robert Cox's deconstructive statement on the ontology of knowledge, with an objective epistemological statement that "any theory of knowledge production needs to have a power dimension".