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Paul's expressed confidence in his sheep was based in the fact that he constantly rooted out the “dogs returning to their vomit.”
Really the dogs outnumber the sheep in every congregation; that is exactly why Paul and Peter issued those stern warnings to the sheep they loved.
Matthew 7:
[13] Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
[14] Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
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Kindly deal with the scripture that YOU posted and I addressed (Hebrews 6). Quote the warning, fine. Quote the encouragement too. That book is full of hope, the purpose of the warnings is to bring correction. The purpose of correction is to bring life and represents the love of God. “He is treating you as sons.” That said, i hope you have a blessed day. I’m at work and dreaming of being on my bike because the weather here in Dallas is lovely!