H. Addington Bruce,
Handicaps of Childhood
“ Here we come to the central fact in the whole problem of sulkiness, for, nine cases out of ten, it is the home environment—the training a child receives, the parents' attitude towards him—that is primarily responsible for his sulking. The healthiest child in the world will sulk if his parents surround him with a sulk-breeding environment. He will sulk because it is child nature to react appropriately to the suggestions received from the environment. ”
