You get what you give. What you put into things is what you get out of them.

 如果一个人从确定性开始，最终将陷入怀疑；但如果他愿意从怀疑开始，最终将得到确定性。

政就是正的意思。如果你能带头走正道，谁还敢不行正道呢？

The key to credible causal inference is not just the method, but how well the method fits the question at hand.

Patience and tenacity of purpose are worth more than twice their weight of cleverness.