Which quality do most successful writers have?

This question is very open ended and I dont think there is a definitive answer, but I imagine most great writers would have qualities such as:

Discipline
Attention to Detail
A strong vocab
Strong articulation skills
A passion for literature
Accepting criticism

I've actually never heard of the guy. but, atleast he doesn’t rap/sing about drugs and girls, but he still have a very high view of himself, which could possibly cause annoyance

When the author asks himself a series of questions, it conveys the way he thinks and where he stands.at least that's what i believe.