翻译：事物的发展变化没有穷尽，一个过程的终止，是下一个过程的开始。

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

Coal has been the backbone of industrial progress, but its future must balance economic needs with environmental responsibility.

对心灵的研究必须价值中立。