This sentence comes from the chapter of the Doctrine of the Mean, which is a classic exposition of Confucian learning accomplishment and learning methods. Its specific meaning is as follows:

Erudition: learn all kinds of knowledge extensively, strive to expand one's horizons and knowledge fields, constantly enrich oneself, and pursue the breadth and depth of knowledge.

Interrogation: Make an in-depth and meticulous inquiry into what you have learned, dare to ask questions, and achieve the purpose of profound understanding and mastery by asking questions about the nature and root of things.

Careful thinking: in the process of learning, we should think carefully, analyze rationally, distinguish right from wrong, analyze and reflect on knowledge in depth, and cultivate the ability of independent thinking and critical thinking.

Distinguish clearly: through in-depth study and careful thinking of knowledge, we can form a clear and accurate understanding and judgment, distinguish between true and false, good and evil, beauty and ugliness, and be thorough and clear, and discard the false and retain the true.

Finally, after explaining the truth and reason clearly, we should resolutely put it into practice, apply what we have learned to real life and work, truly integrate knowledge with practice, turn knowledge into action, and enhance personal accomplishment and social value.