矿业必须以可持续发展为核心进化，否则我们可能被淘汰。

商业中最危险的一句话是"我们一直都是这么做的"。

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

A quarry manager needs the precision of an engineer and the vision of a poet.

The only thing that overcomes hard luck is hard work.

I don't like favors; they oppress and make me fell like a slave. I'd rather do everything for myself, and be perfectly independent.