I haven’t read the book you mentioned, but from my opinion derived after studying Maslow and Rogers, is that actualization refers to the result of factors leadi

I haven’t read the book you mentioned, but from my opinion derived after studying Maslow and Rogers, is that actualization refers to the result of factors leading to a fully functioning human, and by proxy, a happy/content/at peace one. If you ever get a chance, look into some of Maslow’s explanations on the characteristics of an individual who has self-actualizated. There are other interesting humanistic psychologists such as Dabrowski that are fascinating as well.