What is the meaning of this quote:“Jane Austen was certainly a more serious and interesting moralist. Her attitude to morality was not...

This is a subjective question. I think the person speaking is saying that she was not rigid or dogmatic in her moralistic beliefs, but was "less relaxed" because she was growing as a person, and as such, over time, she would come into her own morality as opposed to that which she might have been raised with.

All humans are like this pretty much; I don' like that my mom yelled a lot and so am determined that I will not be a yelling person. some might assume mom yelled out of anger or frustration and perhaps I have determined that this is a bad quality and therefore choose not to yell at my children.

My mom however, may have been part of a household that never spoke, and so she decided she would communicate w/ her family however loud that might be.So, to her, the issue would presume that her mom didn't care about her because she didn't talk to her.