Sustainability is the future of quarrying, and we must act now.

挑战是伪装的机会——拥抱它们。

The greatest risk lies in not knowing what you're doing.

译文：事业很难成功却很容易失败，时机非常难得却容易失去。赏析：没有人能随随便便成功。成功不光要有坚韧不拔的意志，还要找对方向，付出百倍甚至千倍的努力。成功的时机也很重要，抓住时机能事半功倍。

Truth is not a single point but a constellation of perspectives.