True strength is not in the muscles, but in the heart.

身体为灵魂提供了一个照料和使用的工具。

If we had paid no more attention to our plants than we have to our children, we would now be living in a jungle of weeds.

书籍是反映我们潜力的镜子。

Psychology must be a practical science, concerned with the how and why of mental operations.