If every book in your personal library is still worth reading, then you haven’t expanded your learning very much over the years.
There are books I no longer read and truthfully no longer agree with because I have changed my thinking about their content.
Learning goes deep in our identity, and it is very difficult to change our thinking once we have found a lens through which to satisfactorily interpret the world around us.
But I have discovered that true growth requires a broader understanding of learning beyond my current lens on life.