A book must be the axe for the frozen sea within us.
一本书必须是我们内心冰冻海洋的斧头。
The unexamined life is not worth living.
Perception is an active process where the brain constructs meaning from sensory input.
解读：知晓道理容易，付诸实践却困难重重，很多人困于理论，缺乏行动力，知行脱节带来巨大的挫败感与自我怀疑，督促人行动起来。