1. If you act prudently, you can strengthen your ambition, and if you speak prudently, you can admire your virtue. - "Hu Hong Zhiyan·King Wen" by Hu Hong of the Song Dynasty

Prudent behavior can strengthen you Only by being cautious about your own aspirations and speech can you improve your moral character.

2. The partition wall must have ears, so there is no one outside the window. ——Yuan·Anonymous "Raising Cases and Qi Mei San".

Be careful of someone eavesdropping through the wall, and be careful of someone peeking outside the window when moving. This sentence teaches people to be cautious in their words and deeds, and not to be careless in everything.

3. Therefore, no sound is too small to be heard, no action is invisible but not visible. ——"Xunzi Encouraging Learning".

No matter how quiet your voice is, it will never go unheard. No matter how secret the action is, it will be known. This sentence means that people should be careful in their words and deeds.