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
Deus caritas est into English as , while in most contemporary English translations it reads "God is love" (since the word "charity" is derived from ). The Latin version of the First Epistle of John uses the same formulation, "Deus caritas est", at the end of translating . This second biblical reference is not mentioned in the encyclical. In this encyclical, Benedict reflects on the concepts of "eros", "agape", and "philia", and their relationship with the teachings of Jesus. "Eros" and "agape" are two of the various Greek words for love, each of which has a slightly different shade of meaning: "agape" is