Scientia potentia est phrase ""sapientia est potentia"" is often translated as "wisdom is power". The earliest documented occurrence of the phrase "Knowledge is power" is from Imam Ali (599-661 CE), as recorded in the tenth-century book Nahj Al-Balagha (originally in Arabic). He said: Another account of this concept is found in the Shahnameh by the Persian poet Ferdowsi (940–1020 CE) who wrote: "Capable is he who is wise" (in Persian: توانا بود هر که دانا بود). This hemistich is translated to English as "knowledge is power" or "One who has wisdom is powerful". A proverb in practically the same wording is found in
Non est factum generally that: "Non est factum" is difficult to claim as it does not allow for negligence on the part of the signatory, i.e. failure to read a contract before signing it, or carelessness, will not allow for "non est factum". Furthermore, the Court has noted that there is a heavy onus that must be discharged to establish this defence as it as an "exceptional defence." In "Petelin v Cullen" (1975), the defendant, Petelin, was illiterate and could speak very little English, but still signed a document he believed to be a receipt for $50 but actually gave Cullen the option