The best performance improvement is the transition from the nonworking state to the working state.

The secret to living is giving.

有两种自由——一种虚伪的自由，一个人可以为所欲为；一种真正的自由，一个人可以为所应为。

Reinforcement is the central factor in the acquisition of new behavior patterns.

我不后悔任何事情，因为每一步都让我走到了这里。