Man is so much the voice of his interest that it is not enough to make him see the right, but you must make him feel it.
"No hay nada más peligroso que una idea cuando es la única que se tiene."
如果你想成功,你必须从长远考虑。短期收益往往会导致长期损失。
心理学必须避免一切形式的心灵主义。