:6) The description and classification of these processes of transformation disclose a hierarchy of logical types immanent in the phenomena. - Gregory Bateson

Our initial sensory data are always "first derivatives," statements about differences which exist among external objects or statements about changes which occur either in them or in our relationship to them. Objects and circumstances which remain absolutely constant relative to the observer, unchanged either by his own movement or by external events, are in general difficult and perhaps always impossible to perceive. What we perceive easily is difference and change — and difference is a relationship.

Logic is a poor model of cause and effect.

Things have to be done fast in America, and therefore therapy has to be brief.