Source: 1980s, That Benediction is Where You Are (1985), p. 63 
Context: Are we wasting our lives? By that word “wasting” we mean dissipating our energy in various ways, dissipating it in specialized professions. Are we wasting our whole existence, our life? If you are rich, you may say, “Yes, I have accumulated a lot of money, it has been a great pleasure.” Or if you have a certain talent, that talent is a danger to a religious life. Talent is a gift, a faculty, an aptitude in a particular direction, which is specialization. Specialization is a fragmentary process. So you must ask yourself whether you are wasting your life. You may be rich, you may have all kinds of faculties, you may be a specialist, a great scientist or a businessman, but at the end of your life has all that been a waste? All the travail, all the sorrow, all the tremendous anxiety, insecurity, the foolish illusions that man has collected, all his gods, all his saints and so on — have all that been a waste? You may have power, position, but at the end of it — what? Please, this is a serious question that you must ask yourself. Another cannot answer this question for you.
                                    
“Reptiles and amphibians are sometimes seen as simple, primitive creatures. That's a long way from the truth. The fact that they are solar-powered means that their bodies require only 10% of the energy that mammals of a similar size require. At a time when we ourselves are becoming increasingly concerned about the way in which we get our energy from the environment and the wasteful way in which we use it, maybe there are things that we can learn from "life in cold blood."”
            Closing lines 
Life in Cold Blood (2008)
        
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David Attenborough 70
British broadcaster and naturalist 1926Related quotes
                                        
                                        Source: The Future As History (1960), Chapter IV, Part 9, The Grand Dynamic of History, p. 209 
Context: In an age which no longer waits patiently through this life for the rewards of the next, it is a crushing spiritual blow to lose one's sense of participation in mankind's journey, and to see only a huge milling-around, a collective living-out of lives with no larger purpose than the days which each accumulates. When we estrange ourselves from history we do not enlarge, we diminish ourselves, even as individuals. We subtract from our lives one meaning which they do in fact possess, whether we recognize it or not. We cannot help living in history. We can only fail to be aware of it. If we are to meet, endure, and transcend the trials and defeats of the future — for trials and defeats there are certain to be — it can only be from a point of view which, seeing the future as part of the sweep of history, enables us to establish our place in that immense procession in which is incorporated whatever hope humankind may have.
                                    
Presidential campaign (April 12, 2015 – 2016), Democratic Presidential Debate in Miami (March 9, 2016)
Responding to a question from a Reddit user about whether open racism and slurs are allowed on the platform. As quoted in Open racism and slurs are fine to post on Reddit, says CEO https://www.theguardian.com/technology/2018/apr/12/racism-slurs-reddit-post-ceo-steve-huffman (12 April 2018) by Samuel Gibbs, The Guardian.
                                        
                                        Source: Hebb, D. O., The Organization of Behavior, John Wiley & Sons, Inc., New York, 1949. 
Source: On Human Communication (1957), On Cognition and Recognition, p. 304
                                    
2000s, 2008, First Speech As London Mayor (May 3, 2008)
Source: Quotes of Paul Cezanne, after 1900, Cézanne, - a Memoir with Conversations, (1897 - 1906), p. 160, in: 'What he told me – I. The motif
On how female comedians might initially doubt themselves in “Phoebe Robinson: There's No Excuse For The Lack Of Diversity In Comedy” https://www.npr.org/2018/10/15/657459180/comic-phoebe-robinson-theres-no-excuse-for-hollywoods-lack-of-diversity in NPR (2018 Oct 15)