Proverbs come from a variety of sources. Some are, indeed, the result of people pondering and crafting language, such as some by Confucius, Plato, Baltasar Gracián, etc. Others are taken from such diverse sources as poetry, stories, songs, commercials, advertisements, movies, literature, etc. A number of the well known sayings of Jesus, Shakespeare, and others have become proverbs, though they were original at the time of their creation, and many of these sayings were not seen as proverbs when they were first coined. Many proverbs are also based on stories, often the end of a story. For example, the proverb "Who will bell the cat?" is from the end of a story about the mice planning how to be safe from the cat.