I feel like this is good advice. I believe that whatever your brain hears, even if it’s from yourself, it believes on some level. Like your brain just accepts everything at face value, and only after consciously thinking about it can it decide if it’s really true or not.

So negative self-talk is terrible because just hearing those words is enough for your brain to believe them, at least a little bit. Ditto for positive things.

I can’t remember her name but I recall a video of a woman advising looking in the mirror once everyday and saying “I am enough”.