In mathematics, truth is always relative to the system you're working in.

"Every book is a door to another world, waiting to be opened by the curious mind."

释义：听得多了，看得多了，才能够体察出事物中的精要，才能够选择事物好的一面进行学习，选择正确的道理进行遵从。

孩子越能够专心，就越能从工作中得到平静，就越能发自内心地纪律或规则。

比喻要有长期坚持和忍耐的毅力。