A man was traveling to Russia. When he was shopping, he found two strange people: one was digging a hole in the front, and the other was filling the dirt with a shovel at the back. The man thought it strange, so he asked them what they were doing. They replied that they were planting trees. The man found it even weirder. The two men explained that the man in charge of planting the saplings was ill and did not come.
This passage gives us the enlightenment that there should be a sense of responsibility in the work.