It is on the strength of observation and reflection that one finds a way. So we must dig and delve unceasingly.

When I see someone wasting a glass of water, I think of those who don't have water on Earth.

出自汉·桓宽《盐铁论·后刑》。锄去田里有害的杂草，禾苗就可以健康地生长；惩罚为非作歹的恶人，百姓就会感到喜悦。