What might lead to a commitment, ? a decision to make a commitment to make the relationship last?

为什么作出承诺，决定承诺维持双方的关系？

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if you have all three, intimacy, passion, commitment, this is "consummate love" according to Sternberg complete love.

如果亲近，激情和承诺三者兼而有之，这就是完美式爱情，完整的爱情。

耶鲁公开课 - 心理学导论课程节选

We have to resist excessive commitment to this idea of it being a center, but it is at least not a center which somehow stands outside of itself and is a center only in the sense that it is some remote, hidden, impersonal, distant cause.

我们必须反对对这个观点过多的承诺,这个人为它是中心的观点，但它至少不是一个,以某种方式处于自身之外的中心，而只在某种意义上是中心,比如说，它有些偏僻，隐蔽，客观，遥远。

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This is physical attraction with close bonding but no commitment, Romeo and Juliet when they first met.

爱慕对方身体,关系亲密，但没有承诺，就像罗密欧遇到了朱丽叶。

耶鲁公开课 - 心理学导论课程节选

The commitment is there but at that moment nothing else might be there.

当时，只有单纯的承诺,不再有其他因素。

耶鲁公开课 - 心理学导论课程节选

It's best if you don't know what that is or even if you do mistakenly attribute it, misattribute it, to physical attraction, romance, intimacy, passion and commitment, it's love.

最好是如果你不知道是什么,甚至如果你错误认定，以为是生理吸引力，浪漫，亲密，激情和承诺，那是爱情。

耶鲁公开课 - 心理学导论课程节选