True progress happens when we step out of our comfort zones and embrace change.
父子之间要亲爱,君臣之间要有礼义,夫妇之间要挚爱但还要有内外之别,老少之间有尊卑之序,朋友之间要有诚信之德。
I write to understand what I think.
The best way to learn mathematics is to do mathematics.