Enjoyment appears at the boundary between boredom and anxiety, when the challenges are just balanced with the person’s capacity to act.

Daniel Kahneman Thinking, Fast and Slow

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Mihaly Csikszentmihalyi Flow: The Psychology of Optimal Experience (Harper Perennial Modern Classics)

Mihaly Csikszentmihalyi Flow: The Psychology of Optimal Experience (Harper Perennial Modern Classics)

David Rock, Linda J. Page Coaching With the Brain in Mind

Cal Newport Deep Work: Rules for Focused Success in a Distracted World