Just my interpretation of the quote, but it feels like it’s focusing on morality and it’s consistancy, or there lack of. Also, emphasis on indisputably and inherently.
Morals change with facts and experiences you go through. Nothing is forever good and bad, you can think something is good for most of your life until an experience proves it otherwise. Like for example, charity you would think is always good, however later on you would, for example, hear about how the people you are supposedly helping end up becoming dependant and are unable to sustain themselves without help.
Morals change, and when they change then the previous morals you had were technically false and invalid as you’ve had a change of mind and/or heart.
Morals can vary from person to person. Therefore, “good” and “evil” can be talked about and people have different values which may conflict with yours.
I’m ofc not the writer though, so I wouldn’t know what they mean. This is just my take on it, and I hope it helps. If not, then so be it. I hope you find a house you believe you fit in with :)