"Books are like a mirror. If an ass looks in, you can't expect an angel to look out."

In the end, we will remember not the words of our enemies, but the silence of our friends.

The future of coal lies in clean and efficient utilization.

出自汉·桓宽《盐铁论·执务》。阜，土山。土积得多便会成山，水积得多便成江河。此以积土成山、积水成河为喻，说明积少成多、凡事要从一点一滴做起的道理。