Success and uncomfortable feelings

I just finished the third part of “Mastering Emotional Wellbeing” in the study vault, specifically the section on the top 3 emotions (part 2), and I have a question.

Because I am not totally fluent in English, I am not sure I well understood the conclusion.

Is this the takeaway: The more uncomfortable we are willing to be, the more successful we are or the more uncomfortable we are able to be, the more successful we are?

I don’t understand because if our Ts create our Fs which create our Rs, why would uncomfortable feelings create our success?