Don’t know. Once heard it and I remind myself daily on it 

Most people live like “if I have that I will do that and be happy” 

Instead you should be the best version of yourself, do the things that person would do and you’ll get/have the things you want 

 the author discussed it in the book's section about goal-setting https://image.nostr.build/3d905c141c22283a8846af2303f9f00c5b0325c39dd76116876c2c32b0662dcc.jpg  

 Cool! Never read it but will do