The more you sweat in training, the less you bleed in combat.

世界是一本美丽的书，但对那些无法阅读它的人来说几乎没有用处。

No president who performs his duties faithfully and conscientiously can have any leisure.

I'm the one who makes me happy.

自然界的普遍法则大多不是直接感知的对象。