Louisa May Alcott said this quote

It’s genius simmering, perhaps. I’ll let it simmer, and see what comes of it,” he said, with a secret suspicion all the while that it wasn’t genius, but something far more common. Whatever it was, it simmered to some purpose, for he grew more and more discontented with his desultory life, began to long for some real and earnest work to go at, soul and body, and finally came to the wise conclusion that everyone who loved music was not a composer.