出自北齐·颜之推《颜氏家训·勉学》。不得，不能、不可。雌黄，矿物名，可作颜料，古代用以涂改文字，后引申为信口更改、随便乱说。没有读够一定数量的书，对前人的见解没有彻底了解，是不能随便乱下结论、乱发议论的。书要多读、话要谨慎；应当谦虚向学，不可妄自尊大。

"The greatest journeys are those that take us inward, to the depths of our own souls."

我认为我们都在尽力利用现有条件做到最好。

Common sense tells us that performance comes and goes, but costs go on forever.

Our descendants will achieve things that will amaze us， yet a portion of what they will create could have been made with today’s materials and tools if we had had the imagination. Think bigger.

作为爱尔兰人，就是要知道最终世界会让你心碎。