This was the podcast I got this quote from.
"People give up not because of their ability, but because of their inability to deal with their feelings."
- Dr Marc Brackett - Behavioural Researcher & Professor at Yale
Brene gets a bit gushy over this guy at the start but if you can get past that. There are some real nuggets in this episode.
https://brenebrown.com/podcast/dr-marc-brackett-and-brene-on-permission-to-feel/