自由的代价是永远保持警惕。

All behavior is motivated by some form of drive reduction.

【译文】得到恩惠很深时应及早退出身来，春风得意时要及时罢休。千万不要等到是非传入耳内，致使过去的恩爱变成怨仇。

The quality of an organization's innovation determines the quality of its growth.

心灵是卓越的调节器官。