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

Every day is a chance to get better. Don't waste it.

出自汉·桓宽《盐铁论·相刺》。释义：碎玉满箱，算不得拥有财宝；读了几箱子的书，也不等于就掌握了其中的道理。