"Learning without thinking is useless, thinking without learning is dangerous" tells us that only by combining learning and thinking can we learn practical and useful knowledge, otherwise we will have little effect. That is, he is good at integrating theory with practice, summarizing, and understanding memory.

This sentence is a reading and learning method advocated by Confucius. It means that if you just read without thinking, you will not be able to use the knowledge in the book reasonably and effectively because you cannot deeply understand the meaning of the book, and you will even get confused. And if you just dream without actually studying and studying, you will end up building a tower on sand and gain nothing.

Confucius said: "Learning without thinking will lead to failure; thinking without learning will lead to peril." From Confucius' "The Analects of Confucius: For Politics"

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This sentence comes from "The Analects of Confucius", which is a collection of quotations from Confucius and his disciples. It was compiled by Confucius's disciples and his disciples, and was completed in the early Warring States Period. The book consists of 20 chapters and 492 chapters, mainly in the form of quotations and supplemented by narratives. It mainly records the words and deeds of Confucius and his disciples, and embodies Confucius's political opinions, ethical thoughts, moral concepts and educational principles in a relatively concentrated manner.

This book is one of the classic works of the Confucian school. It is called the "Four Books" together with "The Great Learning", "The Doctrine of the Mean" and "Mencius", plus "The Book of Songs", "Shangshu", "Book of Rites" and "Book of Changes" "Spring and Autumn", collectively known as "Four Books and Five Classics".