Upon Further Reflection. Chapter 1: Why We Are Not Acting to Save the World. Quote 3 Post author:B. F. Skinner Foundation Post published:February 12, 2020 Post category:Skinner's Quote of the Day “The concept of purpose has been replaced by that of selection, which was first recognized by Darwin and Wallace in the natural selection of species.” (p. 2) You Might Also Like Verbal Behavior: Extended Edition. Chapter 9: Multiple Causation. Quote 15 June 4, 2025 Upon Further Reflection. Chapter 12:The Contrived Reinforcer. Quote 1 December 18, 2020 Science and Human Behavior, Chapter 19: Social Behavior, Quote 6 December 5, 2016