Do not listen to what they say.
If they believed it, they could have done it themselves.
They are advising us, and haven’t executed that advice in their own lives.

When we receive advice from someone who hasn’t put that to use in their own lives, our instant reaction is to question its credibility. 

However, what if their advice could be for our good?
What if the advice comes from a place of regret?
What if they wished they had also received that advice?

Listening to advice who haven’t applied it in their lives isn’t foolish.
It might save us from the same mistakes that they made. And didn’t wish they did.