“Attention is like energy in that without it no work can be done, and in doing work is dissipated. We create ourselves by how we use this energy. Memories, thoughts and feelings are all shaped by how use it. And it is an energy under control, to do with as we please; hence attention is our most important tool in the task of improving the quality of experience.”

—Mihaly Csikszentmihalyi, Flow: The Psychology of Optimal Experience