Charles Ellicott Commentary 1 Timothy 1:19

"holding faith and a good conscience; which some having thrust from them made shipwreck concerning the faith:" — 1 Timothy 1:19 (ASV)

Holding faith, and a good conscience. Again, as in 1 Timothy 1:5, the Apostle joins “faith” and “the conscience undefiled.” In the mind of St. Paul, “want of faith” was no mere refusal to accept a definite religious dogma, but was always closely connected with impurity and the love of sin. If a man dares to do willful violence to his better nature, he must not presume to dream of faith saving him. The thought expressed by another inspired teacher seems to run constantly in the mind of St. Paul: The devils also believe and tremble.

Which some. “Some.” A quiet reference here is made to those false teachers who seem to have been doing such evil work at Ephesus among the Christian believers, and against whom Timothy is so urgently warned to be on his guard in the 6th and following verses of the chapter (1 Timothy 1:6 and following).

Having put away. The simile in St. Paul’s mind is a nautical one. The “good conscience” represents the ballast, or cargo, of the ship. When this is put away—tossed overboard—the vessel becomes unmanageable and is tossed about, the plaything of the waves, and in the end is wrecked.