Commonly used words at the beginning of quotations include a famous saying, a philosopher once said, a poet once wrote, and a saying.

1. A famous saying is usually used to quote a famous or well-known statement as the source of an article's opinions or arguments. Such a beginning can increase the authority and persuasiveness of the article, and can also arouse the reader's interest and thinking.

2. A philosopher once said that it is usually used to quote the remarks of a famous philosopher to provide philosophical thinking or inspiration for the article. Such a beginning can increase the depth and breadth of the article, and can also demonstrate the author's understanding and thinking of philosophy.

3. A poet once wrote. It is usually used to quote the verses of a famous poet to provide poetic and literary color to the article. Such a beginning can increase the poetry and beauty of the article, and can also show the author's appreciation and thinking about literature.

4. There is a saying that knowledge is power. This quotation starts with the sentence "knowledge is power" and introduces the theme of the article - the importance of knowledge by quoting this sentence. At the same time, the quoted content is also related to the topic of the article and can provide strong support and argument for the article. This kind of opening can increase the authority and persuasiveness of the article and guide readers to think deeply.

Advantages of quotation-style openings:

1. Guide readers to think: Quotation-style openings usually quote some famous quotes, philosophies or poems with profound connotations. These quotations can guide readers to think. Think deeply. In the process of reading the article, readers will be inspired by the quoted content and further think about the content related to the topic of the article, so as to better understand and accept the views and arguments of the article.

2. Enhance the depth of the article: By quoting famous quotes, philosophy or poetry, the quotation-style beginning can provide a richer cultural background and ideological connotation for the article. These quotes often have high cultural value and ideological depth, which can make the article more profound and broad. At the same time, the quoted content can also provide more thinking angles and argument support for the article, making the article more rigorous and powerful.

3. Show the author’s quality: The quotation-style opening requires the author to have extensive knowledge reserves and high cultural literacy. Only with in-depth understanding and thinking about the relevant fields can we appropriately select and quote famous quotes, philosophies or poems. Therefore, this opening method can demonstrate the author's literacy and knowledge level, making readers trust and respect the author.