疾病是生命的阴暗面，一种更沉重的公民身份。每个出生的人都持有双重国籍，在健康王国和疾病王国中。
Illness is the night-side of life, a more onerous citizenship. Everyone who is born holds dual citizenship, in the kingdom of the well and in the kingdom of the sick.
Keep your face always toward the sunshine—and shadows will fall behind you.
The poem is a way of seeing the world, not just describing it.
The success of an enterprise depends not only on the external environment but also on internal management.