"Don't deceive and don't be deceived."
Among the contents of this teaching, I have one thing as homework.
"Don't be deceived by yourself!"
In my consciousness, the words and behavior remain as they are which I have done during my past lives and my present life. The problem is that the words and behavior will continue to appear in the future. This situation can be easily understood by taking an example of bad habits. Bad habits don't happen simply continuously but deceive me into doing the same things continuously. This is relevant not only to bad habits but seeing, hearing, accepting, judging, practicing, etc.
Then, how can we not be deceived?
For reference, wrong teachings end with just words but true teachings provide proper and concrete ways.