Appreciate everything your associates do for the business. Nothing else can quite substitute for a few well-chosen, well-timed, sincere words of praise. They're absolutely free and worth a fortune.

Happiness requires both pleasure and purpose - neither alone is sufficient.

Reason is the cold sun, it gives light but no warmth.

在困难时刻，我们不是被环境定义，而是被我们的反应定义。

数学不是一项观赏性运动。