This is the only effectual way to secure our present and future happiness.

这是确保我们现在和未来幸福的唯一有效途径。

《柯林斯英汉双解大词典》

This is the only way to happiness!

这是通往幸福的唯一途径！

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Everyone will agree, he argues, that happiness is the ultimate end to be valued for itself and really only for itself.

他认为，每个人都会同意，幸福是且只是人们因其本身而珍视的终极目标。

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As such most of the happiness measures only measure happiness according to extroverts, not overly surprising considering the authors.

FORBES: 5 Not-So-Secret Powers of Extroverts

When a dog devotes so much of herself to your happiness, it only stands to reason you would want to make that dog happy in return.

NPR: 'Dog is My Co-Pilot'

These examples, however, prove only that happiness surveys may be second only to infidelity surveys on the scale of unreliability.

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