Commentaries:
Paul implies that the vessels (people) in God's house (Family or Temple) are not all of the same quality. But if we work and apply ourselves to purge and purify what is defiling and dishonoring, we can become a vessel of honor (I John 3:3). We all begin as vessels of dishonor. Even after the blood of Jesus Christ cleanses us, we sin, thus dishonoring both Him and our character. From this dishonor we must be continually cleansed.
John W. Ritenbaugh
The Elements of Motivation (Part Three): Hope
God plainly says here that He can make a vessel of honor or one of dishonor. It is His choice. Matthew 13, in the Parable of the Sower and the Seed, shows that God permits Satan to sow tares within the fellowship. These tares are not church members. A tare looks much like wheat until the fruit appears, and then one can tell that it is not wheat. People who are tares will be religious and look a lot like church members, but are they converted? The principle is that God will permit tares to be sown within the fellowship. The Temple of God, His house, will be seeded with vessels of honor and those of dishonor.
John W. Ritenbaugh
Unity (Part 3): Ephesians 4 (A)
Other Forerunner Commentary entries containing 2 Timothy 2:19:
Matthew 13:44