其次，我如何保证我与配偶和家庭的关系能够成为持续的快乐源泉。

Second, how can I be sure that my relationships with my spouse and my family become an enduring source of happiness?

如果你看过，你就会同意这是一个说明态度是快乐源泉的最好例证。

If you do, you will agree with me that it is a good example of how attitude is 100% for becoming happy.

尽管亲密的、意味深长的感情有成为真正的、持久的快乐源泉的潜能，担这方面的科学研究依然不甚清晰。

While a close and meaningful relationship has the potential to be a real and lasting source of happiness, scientific research in this area is obscure.