What are the three reading methods?

There are three kinds of reading, namely, heart, eyes and mouth. If the heart is not in the book, then the eyes will not read it carefully. Because of inattention, I can only look casually and never remember. Even if you remember it, it won't last long. Of the three, consciousness is the most important.

From the Southern Song Dynasty Zhu's "Rules of Training and Learning": When reading, you should read every word loudly and make no mistakes. You can't miss a word, you can't pour a word, and you can't be far-fetched. As long as you recite it several times, it will be catchy and unforgettable. The ancients said, "Read it a thousand times and see what it means." If you read well, you don't need to explain yourself. I have tasted that reading has three meanings: heart, eyes and mouth. If the heart is not here, the eyes will not look closely, and the heart will not be single-minded but will read freely. You must never remember it or keep it for a long time.