Since Hebrew was taught as a foreign language in ancient Greece, foreign language teaching methods have evolved and recycled century after century, making their "authors" temporarily famous until the next "new" method appeared on the market. All of the popular approaches of the 20th Century have been used before. An authoritative history which reveals how this has progressed is, Twenty Five Centuries of Langue Teaching. This classic can be found in any good university library, as well as in larger public libraries. The success of these methods depended on the needs of each particular decade. The most successful foreign language teachers have been flexible enough to adapt to their own teaching styles techniques from some of these approaches. There are many methods texts, but each one espouses the teaching approach of the current popular fad. One text that helps the teacher reach his or her potential in effective teaching is, A Handbook, which accounts for the evolution of teaching methods and the diversity of teaching styles.