Quote by William Stern

"The child is not a miniature adult, but a being in the process of development."

"Psychology must study the whole person in their total environment."

"Intelligence is not fixed but develops through interaction with the world."

"The mind grows through activity and experience."

"You can't expect to be happy if you're surrounded by mess."

"Health and happiness - these are true wealth"

"How can you live like this? It's like a pigsty!"

"You're going to get sick living like this."