Commentaries:
Robertson's Word Pictures (NT)
A form of godliness (morfwsin eusebeiav). For morfwsin, see Romans 2:20. The outward shape without the reality.
Having denied (hrnhmenoi). Perfect middle participle of arneomai (see II Timothy 2:12 f.).
Power (dunamin). See I Corinthians 4:20. See Romans 1:29-31 for similar description.
Turn away (apotrepou). Present middle (direct) imperative of apotrepw, "turn thyself away from." Old verb, only here in N.T. See IV Macc. 1:33.
Other Robertson's Word Pictures (NT) entries containing 2 Timothy 3:5:
Romans 2:20
2 Timothy 2:11
Revelation 3:1
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