'Thou shalt not make unto thee any graven image'

To a certain degree we are really the person that others have seen in us, friends as well as foes. And it works both ways: we ourselves are the author of others; in some mysterious and inescapable way we are responsible for the face they show us, responsible not for the disposition itself, but for the development of that disposition. It is we ourselves who stand in the way of a friend whose settled habits cause us concern, for the reason that our opinion that he is settled in his habits is a further link in the chain that binds and is slowly strangling him. We would like him to change -- oh yes, we wish the same for whole nations! But all the same we are by no means prepared to give up our preconceived ideas about them. We ourselves are the last to change those. We think of ourselves as mirrors, and only very seldom do we realize to what extent the other person is himself the reflection of our own set image, our creation, our victim -- ​
Sketchbook 1946 - 1949, p18​ (Harcourt Brace Jovanovich)
translated by Geoffrey Skelton 
Link to original text in German