Google了一下亚里士多德的这句话，发现了这个link，觉得说得不错，试着翻译看看。

"Happiness is the meaning and the purpose of life, the whole aim and end of human existence” - Aristotle
"幸福是生命的意义和目的，是人生活的动力，以及活着，就会一直追求的唯一目标” - 亚里士多德

http://www.pursuit-of-happiness.org/history-of-happiness/aristotle/  

In conclusion, according to Aristotle, what is happiness?
亚里士多德对幸福的定义是什么？

• Happiness is the ultimate end and purpose of human existence.

幸福是人一生至死不渝所追求的生活目标。

• Happiness is not pleasure, nor is it virtue. It is the exercise of virtue.

幸福不是娱乐，也不是美德。它是针对美德的实践行为。

• Happiness cannot be achieved until the end of one's life. Hence it is a goal and not a temporary state.

人在生命的终止之前，是无法实现幸福的。故此，幸福是一个目标，不是一个暂时状态。

（我有些不同的想法。人在活着的时候当然可以享受幸福，只是人不会满足这短暂的幸福，所以一旦这短暂的幸福淡化掉了，消失了，人就会赶快去寻找下一个幸福点。故此，幸福是人一生至死不渝的追求。）

• Happiness is the perfection of human nature. Since man is a rational animal, human happiness depends on the exercise of his reason.

幸福是人性的完善。由于人是有原因和逻辑的，所以人的幸福取决于这些原因和逻辑而引发的行为结果。

• Happiness depends on acquiring a moral character, where one displays the virtues of courage, generosity, justice, friendship, and citizenship in one's life. These virtues involve striking a balance or "mean" between an excess and a deficiency.

幸福取决于人的一生对其品德的追求，具体表现为勇气，慷慨，正义，友谊和公民道德，而且我们还需要极为小心地维系这些品德之间的平衡。

• Happiness requires intellectual contemplation, for this is the ultimate realization of our rational capacities.

幸福需要智慧慎思，因为它决定了我们最终能将多少理性潜能转变为现实。