My inspiration comes from pain and also joy.

译文：人必须在事情上磨炼，才能立得住;才能做到安静时也安定，行动时也安定。

Objects have always been carried, sold, bartered, stolen, retrieved and lost. People have always given things to other people.

The role of the economist is part scientist, part engineer.

写作是一种对抗遗忘、对抗死亡的方式。

优化阻碍了发展。