That would be knowing your writing whether fiction or non-fiction gives readers something of value, which they can adapt to their lives and improve the quality of living or their character.
To reach as many people as I can with the message of healing, hope, and deliverance. Knowing I can read reviews where a reader says, one of my books helped transformed their situation by reading how a character dealt with theirs will be what satisfies me most.
Yes, I read all my reviews and when I get bad ones, I usually use them to improve in the areas criticized most. However, I think what readers can do, is to send the authors an email and share their bad reviews as a way to help that author fix and improve their work, rather than tarnish their career with reviews than can be used to help that author grow if given in a better. approach.