Knocking for understanding

According to Campus Mawtius, the quote below comes from a sermon by St Augustine (one of his Dolbeau sermons: "Sermo Beati Augustini super Verbis Apostoli ad Galatas"). Apart from the 'preach and write books' bit, it describes very well what I am doing writing this blog.

We, who preach and write books, write in a manner altogether different from the manner in which the canon of Scriptures has been written. We write while we make progress. We learn something new every day. We dictate at the same time as we explore. We speak as we still knock for understanding.

(Many thanks to Rogue Classicism)