数学的力量来自于它的抽象和概括能力，将具体问题转化为普遍真理。
The power of mathematics comes from its ability to abstract and generalize, turning specific problems into universal truths.
I declare after all there is no enjoyment like reading! How much sooner one tires of anything than of a book!
人生之初，即有忧愁，与生俱来也。