[O]ne of the greatest difficulties encountered in bringing about favorable change is this almost inescapable illusion that there is a perduring, unique, simple existent self, [which is] in some strange fashion, the patient's, or the subject person's, private property. — Harry Stack Sullivan Copy Share Image
![“[O]ne of the greatest difficulties encountered in bringing about favorable change is this almost inescapable illusion that there is a perduring, unique, simple existent self, [which is] in some strange fashion, the patient's, or the subject person's, private property.” quote by Harry Stack Sullivan](https://sms4smile.com/quotes/img-quotes/c90/harry-stack-sullivan-27472_adversity_o-ne-of-the-greatest-difficulties-encoun_2365397.jpg)