Dean Koontz said this quote

She would have thought that working and living in continuous happiness, harmony, and security day after day would lead to mental lethargy, that her writing would suffer from too much happiness, that she needed a balanced life with down days and miseries to keep the sharp edge on her work. But the idea that an artist needed to suffer to do her best work was a conceit of the young and inexperienced. The happier she grew, the better she wrote.