●If you are a fish in the abyss, it is better to retreat and build a net●It is much more useful to know a few useful things than to learn many things that are useless to you (Little Neseka)●See the wood in the mountains, He knows everything about long and short; he sees grass in the wild, and he knows everything about big and small. However, you cannot cut down trees to make houses or gather grass to prepare medicines, knowing that these plants and trees cannot be used (Wang Chong of the Han Dynasty). The most useful thing in a house is the toilet (Geyedi). Learn how to use it, and use it. What he learned (Liang Qichao, Qing Dynasty) ●Study should have practical skills and practicality (Zhu Zhiyu, Ming Dynasty) ●Practice is the most important thing, and being involved in the false is a warning (Zhang Zhuo, Song Dynasty) ●Many people have never heard of "rationality" People who use this word still live according to reason (Democritus). Speculative reasoning has cost philosophers so much pain, but it is often formed naturally and without thinking by lay people (Hume). A person may believe many things. Nonsense, but still able to arrange his daily work in a reasonable and happy way (Norman Douglas) ●A person often has the right actions, but rarely has the right theory (E. Hubbard) ●Is it because Since a mule is neither a horse nor a donkey, doesn't it make it the most useful beast of burden? (Lessing) ●"Real things" are all things that exist objectively. "Is" is the internal connection of objective things, that is, regularity. "Seeking" means that we study (***) ●The success of our open-mindedness, Not relying on textbooks, but relying on practice and seeking truth from facts - (***) ●Science respects facts and cannot talk nonsense or make up reasons to attach a theory (Li Siguang) ●To achieve the desired goal, a realistic spirit is better than rich knowledge More important (Beaumarchais) ● Eat according to the food and tailor your clothes ● Eat and dress according to your possessions ● Cook according to the population and tailor clothes according to your body ● Keep the bowl and eat as much as you want ● How much capital you have, how much business you can do ● Yes If you measure the water, you can move the boat. ● If you don’t have such big feet, you will have such big shoes. Knowing it is knowing it. Not knowing it is not knowing it. It is knowing it. It is knowing it. It is knowing it. It is knowing it.

Knowing is knowing, not knowing is not knowing, this is knowing. Knowing is knowing, not knowing is not knowing, this is knowing