Lesson 1

When someone has made a mistake because they didn’t listen to your advice, you may be tempted to rub it in... "i told you so". When someone suffers because of an error, avoid making comments about what s/he should have done. People can not go backward in time.

 

Lesson 2

Pessimistic statements needlessly causes people to worry about things that never happen. Even if something will go wrong in a year or two, if at present you cant do anything to change the situation, why bring it up? Examples include telling someone who just got engaged "don’t think that marriage is so easy. a lot of people suffer even more after being married... you don’t know what your in for".