You're doing this out of the goodness of your heart?

你这么做是出自良心吗？

And out of the goodness of your heart, you came to his rescue.

所以出于好心，你就来救它了。

Let's suppose your husband begged you to get pregnant, and out of the goodness of your heart, you agreed, even though it might derail your career.

假设你的丈夫求你怀孕，一直求你，然后你出于善良的本性答应了，即便这可能让你的事业脱轨。

The expression " out of the goodness of your heart" means because you are a good person, because you want to help the other person.

“out of your heart” 这句话的意思是因为你是一个好人， 因为你想帮助别人。