John Calvin and Augustine of Hippo
John Calvin is best known for his Institutes of the Christian Religion. This work went through five major editions, and Calvin continually revised it for most of his literary and pastoral life. Like Augustine, he was one of those who write as they learn and learn as they write.
That may be true, that Calvin wrote as he learned, but there is an obvious difference between Augustine and Calvin in this. For Calvin, the fundamental substance of his theology never changed. A look at all five editions of the Institutes will reveal a development (and sometimes substantial), but never a fundamental change. Unlike Augustine, he never had to write a book of retractions.