Recent Issues. Chapter 7: The Operant Side of Behavior Therapy. Quote 3 Post author:B. F. Skinner Foundation Post published:January 24, 2019 Post category:Skinner's Quote of the Day “It has always been difficult to do very much with feelings and states of mind because of their inaccessibility. The environmental variables are often within reach.” (p. 74) You Might Also Like Recent Issues. Chapter 12: The Behavior of Organisms at Fifty. Quote 9 April 11, 2019 Science and Human Behavior, Chapter 20: Personal Control, Quote 4 December 12, 2016 Verbal Behavior: Extended Edition. Chapter 5: The Tact. Quote 1 January 17, 2025