3 things smart people definitely don't allow themselves to make mistakes

In life, there are 3 things smart people definitely don't allow themselves to make mistakes. Each person wants to live well in this society, harmonious coexistence with those around it is very important and to be able to balance relationships harmoniously, smart behavior is extremely necessary.
Normally, in daily speech, smart people will always know how to speak at the right time, at the right place. They often don't say everything they think because more than anyone else they understand, words cannot change. Once said too much, this can cause disaster, possibly being taken advantage of by a small man. Even people who sometimes hurt others don't realize it at times. Even though such a person is not deceived, it is very easy to be harmed by others.
Of course, everyone has the need to communicate with others, but we need to know who we are talking to and what we are talking about. If it is a close friend there would be nothing to hesitate, but if it is someone who is not so familiar, we confide everything to them, assuming they are good people then it's okay, but if they are a hypocrite, we will surely face unpredictable consequences. Therefore, a smart person when interacting with others, they always know how to keep their secrets. There are times when the pressure is great, they do not easily find other people to confide in, but instead, they will promote their talents to complete the things to do, especially with the following three things they never allow themselves to make mistakes.