The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.
天要使一个人遭祸,必先给他一点小小的好处使他轻信;天要使一个人受福,必先给他一点小小的祸患使他有所警惕。
如果易用性是唯一的要求,那么每个人都会还在骑三轮车。