复杂性理论告诉我们，并非所有问题都是平等的；有些问题本质上比其他问题更难。

"The truth is rarely simple, and it’s often more painful than the lies we tell ourselves."

"The writer's job is to be a witness to his time."

系统辨识是从观测到的输入输出数据中建立动态系统数学模型的科学与艺术。

"We always overestimate the change that will occur in the next two years and underestimate the change that will occur in the next ten. Don't let yourself be lulled into inaction."

爱是世界上最强大的力量。

微：小。邪：邪恶，坏事。小的坏事，是大坏事产生的根源。量的渐变必然导致质的突变。小事不注意，必铸成大错。

You don’t need a fancy degree to succeed—you need guts and common sense.