All growth depends upon activity. There is no development physically or intellectually without effort, and effort means work.

All growth depends upon activity. There is no development physically or intellectually without effort, and effort means work.

所有的增长都依赖于活动。没有努力就没有身体和智力的发展，而努力意味着工作。

-- Calvin Coolidge 卡尔文·柯立芝