This book is about the melancholic direction, which I call the “bittersweet”: a tendency to states of longing, poignancy, and sorrow; an acute awareness of passing time; and a curiously piercing joy at the beauty of the world. The bittersweet is also about the recognition that light and dark, birth and death – bitter and sweet – are forever paired. “Days of honey, days of onion,” as an Arabic proverb puts it.