你是自己快乐的钥匙，因此，往前走，一劳永逸地打开它。

You are the key to your own happiness, so go ahead, unlock it once and for all.

youdao

高山的诱惑引我回到科罗拉多，但那时我已确信(即使在我遗忘的时候)快乐的钥匙已经安卧在我的心中，而不是埋藏在那些外在的山丘之间。

The allure of the hills was what brought me back to Colorado. But by then I believed (even when I forgot) that the key to my happiness lies in the inner landscape, not the outer one.

youdao

他们的结论是：“简单地拥有大量东西并不是掌握快乐的钥匙，我们的数据显示，你应该去感激你所拥有的东西。”

Here's their conclusion, "Simply having a bunch of things is not the key to happiness, our data shows that you also need to appreciate the things you have."

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