3. SUCCESS
Mihaly Csikszentmihalyi in his 1990 book Flow: The Psychology of Optimal Experience, stresses the importance of challenge-skill balance.
Shunryu Suzuki in Zen Mind, Beginner’s Mind points out that “when you learn too easily, you’re tempted to not work hard, to not penetrate to the marrow of your practice.”
An easy task requiring no effort = no feeling of success/achievent – no motivation.
Effort + no guarantee – when it results in success, creates motivation.