As a child in Mexico in the 1650s, the nun and writer Sor Juana Inés de la Cruz “abstained from eating cheese because I had heard that it made one slow of wits, for in me the desire for learning was stronger than the desire for eating—as powerful as that is in children.”

Gertrude Stein recalled that on the copy of her final exam for a class taught by William James she wrote, “Dear Professor James, I am so sorry but really I do not feel a bit like an examination paper in philosophy today.” She then left the room. The next day a note arrived from Professor James that said, “Dear Miss Stein, I understand perfectly how you feel. I often feel like that myself”—and then awarded her the highest mark in the course.

Paul Cézanne’s father, a banker, was fond of telling his son, “Young man, young man, think of the future! With genius you die, with money you live.” At least this is according to Émile Zola, who recalled the words of admonishment in one of his letters to his friend Paul. The two had first met as teenagers at boarding school in the 1850s.

“I went sailing up to Great Point, which is fourteen miles. It was fine and rough so we went out in the open ocean and shipped water grandly. I have bought a large swordfish sword for the agassiz of an old salt by the name of Judas,” Ernest Hemingway wrote to his brother Marcelline in one of his earliest known letters, shortly after his eleventh birthday, in 1910.

“Whom the gods love dies young,” wrote Menander in the late fourth century BC. “Whom the gods wish to destroy they first call promising,” Cyril Connolly noted over two millennia later.