This is the NIV translation of the verse and I like how it reads. Typical Hebrew poetic parallelism, it discusses opposites.
The first part of the verse speaks about a good guy. To really appreciate discipline, instruction or direction from others, is to love knowledge. This guy knows discipline will only make him smarter and better.
The second part of the verse speaks about the guy who doesn’t appreciate correction – it calls him “stupid!” The actual Hebrew word means an “animal” — a “brute beast.” The KJV uses the word “brutish” instead of stupid. When we refuse to accept correction, we are acting no smarter than a dumb animal!