Another variation of this: Advice is what the person giving it needs to hear for themself.

This is oddly evident in beginner influencers trying to become gurus on social media. They try to write life advice from a position of superiority, but when you look closely they’re given themselves a little pep talk about how they want to be or what they need to hear. It doesn’t mean the advice is wrong, but you can see through the illusion that you’re hearing sage advice from someone who figured it all out long ago.