Quote by Cyril Burt
"The mind must be trained like a muscle to grow stronger."
More from Cyril Burt
"Intelligence is inherited, but it's the environment that determines how it develops."
"The correlation between intelligence and environment is far more complex than we initially believed."
"Heredity and environment are not opposing forces; they work in concert."
"Psychology must be grounded in measurable data and rigorous statistical analysis."