The mother-child relationship is paradoxical and, in a sense, tragic. It requires the most intense love on the mother's side, yet this very love must help the child grow away from the mother, and to become fully independent.

爱是最终让生命变得可以忍受的唯一东西。

The human brain consists of many specialized circuits that evolved to solve specific problems our ancestors faced during our evolutionary history.

Nature has placed mankind under the governance of two sovereign masters， pain and pleasure.