1. If you don't smell it, if you smell it, if you don't see it, if you see it, if you don't know it, if you know it, if you don't do it, you will stop learning. —— Xun Kuang

2. Industry is good at diligence, and it is barren in play; What is done is thought, but it is destroyed. -Han Yu

3. Nothing is difficult in the world, as long as you are willing to climb. -Mao Zedong