This a common saying that you hear other people say throughout life. However, how many people do you know are completely unaffected by what people say and think? Probably nobody or next to nobody.

This is because if you want to achieve this, there is one crucial aspect that they never mention:

You cannot be affected by praise or flattery either and this is the thing that people cannot overcome. People are regularly praising me, but it's like water off a ducks back.

Let me know your thoughts.