Open your Bible to 1 Timothy 4:6-11 where we encounter what could almost be called a formula for being a good servant of Jesus Christ. In the context it refers specifically to Timothy as the shepherd of the church in Ephesus; but in principle it applies not only to myself but it also applies to every servant of Jesus.
Look at what Paul writes in 1 Timothy 4:6-11. Twice we read the injunction teach these things. It's actually repeated again in verse 15 where Timothy is told to be absorbed in them.
"These things" is more than a reference back to the last few verses, but rather serves to represent everything that has gone before. "these things" is equivalent to "everything I've told you".