If you believe what you like in the Gospel, and reject what you don’t like, it is not the Gospel you believe, but yourself.
― Blessed Augustine of Hippo
There is an equivalent reading of the quote above that would render like this:
If you interpret the Gospel as you like, and reject the Church’s continuous understanding of it from 30 A.D. to 2016 A.D., it is not the Gospel you believe, but your own interpretation of it, and in the end yourself.
Anyone reading or hearing the Gospel is interpreting the Gospel, and the righteous man purpose is to find and assume and interiorize the right interpretation of the Gospel, the one that was continuously witnessed and believed since the day one of the Church.