What does 2 Timothy 2:21 mean?

In verse 20, Paul began an analogy using containers made of various materials. In wealthy homes, vessels of gold and silver were reserved for honorable uses. Vessels of clay or wood were used for more common, or "dishonorable" uses. Continuing this thought here, Paul writes that a Christian can become "a vessel for honorable use" by separating himself from sin. The Greek of this verse literally says "from these things," and the specific reference to "what is dishonorable" is added for clarity in many translations. If anyone cleanses or sets himself apart from the false teaching and sinful life described in verses 16–18, he will be "set apart as holy."

Paul has in mind both a spiritual and literal understanding here. Timothy is to be set apart and holy. However, he is also still talking about vessels. Clean, set apart vessels are "useful to the master of the house." The master is a reference to the Lord. Those set apart as holy are "ready for every good work." "Good work" is also mentioned in 2 Timothy 3:17 as something for which we are equipped through a focus on God's Word. Paul also mentioned the importance of good works elsewhere in the Pastoral Epistles, including 1 Timothy 5:10 and Titus 1:16 and 3:1.