I don't mind saying in advance that in my opinion jealousy is normal and healthy. Jealousy arises out of the fact that children love. If they have no capacity to love, then they don't show jealousy.
Donald Woods WinnicottIt is in playing, and perhaps only in playing, that the child is free to be creative.
Donald Woods WinnicottCreativity consists in maintaining a key aspect of the experience of childhood throughout one's life: the capacity to create and recreate the world. Creativity is the omnipotence of the child's mind.
Donald Woods Winnicott