Yes CaiHong, I have also noticed a correspondence between those who have had an 'awakening' and a better chance of success. I have also noticed that those who have a "personal and honest contact with friends" also seem to do better.
Jung refers to three 'paths' to a higher understanding.
1) an act of grace
or
2)through a personal and honest contact with friends
or
3)through a higher education of the mind beyond the confines of mere rationalism.
I differ only with his use of the word "or". I believe an individual may seek to walk all three paths at once even though one of these ways to a higher understanding might prove to be the most useful.
Realest try this link. It also has a picture of the letter.
A.A. History -- Dr. Carl Jung's Letter To Bill Wilson, Jan 30, 1961
May you all find the higher understanding you seek.