Actions are right in proportion as they tend to promote happiness； wrong as they tend to produce the reverse of happiness.

"It is impossible to go through life without trust: that is to be imprisoned in the worst cell of all, oneself."

Modern quarry management requires geologists' eyes, engineers' hands, and poets' hearts.

Never stop learning; the world is always changing.

每个回声都包含着它所处空间的历史。

成功的关键在于不断学习和适应。