The word "Tiandao rewards those who work hard" was originally "Youzhou" but he actually wrote "Youshou". The pronunciation of 黻 is chóu, and its original meaning is to drink for a long time. When used here, it not only makes sense but also seems very stupid!
The last line of inscription is: Xia Yue in the Jiawu Year (created by him) Yu Jinghua Shenyizhai Youth Book