If you can't explain it simply, you don't understand it well enough.
预测未来的最好方式就是创造未来。
The stones we pull from the earth carry 400 million years of history—we're merely temporary stewards.
出自《论语·泰伯》。没有在哪个位置上担任职务，就不要去考虑那个职位应当过问的事情。
"What good is the warmth of summer, without the cold of winter to give it sweetness."