Abstract
The social psychology of groups. 1959
“Most enjoyable activities are not natural; they demand an effort that initially one is reluctant to make. But once the interaction starts to provide feedback to the person's skills, it usually begins to be intrinsically rewarding.”
Source: Flow: The Psychology of Optimal Experience
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Mihaly Csikszentmihalyi 13
Hungarian American psychologist 1934Related quotes

Source: The Dragons of Eden (1977), Chapter 2, “Genes and Brains” (p. 28)
Source: Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), Successful Recruitment in a Week (2012) https://books.google.ae/books?idp24GkAsgjGEC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIGjAA#vonepage&qnigel%20cumberland&ffalse, Managing Teams in a Week (2013) https://books.google.ae/books?idqZjO9_ov74EC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIIDAB#vonepage&qnigel%20cumberland&ffalse, Secrets of Success at Work – 50 techniques to excel (2014) https://books.google.ae/books?id4S7vAgAAQBAJ&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIJjAC#vonepage&qnigel%20cumberland&ffalse, p.6

Source: Principle-Centered Leadership (1992), Ch. 11 : Thirty Methods of Influence

Source: Défense des Lettres [In Defense of Letters] (1937), p. 22

“Effort only fully releases its reward after a person refuses to quit.”

“Evil happens without effort, naturally, inevitably; good is always the product of skill.”
Le mal se fait sans effort, naturellement, par fatalité; le bien est toujours le produit d'un art.
XI: "Éloge du maquillage" http://fr.wikisource.org/wiki/%C3%89loge_du_maquillage
Le peintre de la vie moderne (1863)