Is says both. Confidence for those who abide in Him, shame for those who don't.I've read the entire letter, actually. It does not say that saved, born again, sealed believers can or will lose their salvation. (Become unborn and unsealed) The above verses are in regard to us having "confidence" and not being "ashamed before Him." These verses are NOT saying that true believers who have passed from death to life and are saved, will lose their salvation.
And hereby we know that we are of the truth, and shall assure our hearts before him. For if our heart condemn us, God is greater than our heart, and knoweth all things. Beloved, if our heart condemn us not, then have we confidence toward God. -1 John 3:19-21
So your position is that Christians can not abide in Him, stand before Him ashamed, and still expect to enter His rest, correct?