"The Ancient Greek word λόγος (logos) is a word with various meanings. It is often translated into English as "word" but can also mean thought, speech, reason, principle, standard, or logic, amongst other things. In philosophy, the term logos was used by Heraclitus to describe human knowledge and the inherent order in the absolute universe: a background to the essential change which characterizes day-to-day life. By the time of Soccrates, Plato, and Aristotle, logos was the term used to describe the faculty of human reason, and the knowledge men had of the world and of each other."