"And do not grumble, as some of them did--and were killed by the destroying angel. These things happened to them as examples and were written down as warnings for us, on whom the fulfillment of the ages has come. So, if you think you are standing firm, be careful that you don't fall!" (1 Corinthians 10:10-12)
"Now, brothers, I want to remind you of the gospel I preached to you, which you received and on which you have taken your stand. By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain." (1 Corinthians 15:1-2)
"if we endure, we will also reign with him. If we disown him, he will also disown us" (2 Timothy 2:12)
"It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age, if they fall away, to be brought back to repentance, because to their loss they are crucifying the Son of God all over again and subjecting him to public disgrace." (Hebrews 6:4-6)
"If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. How much more severely do you think a man deserves to be punished who has trampled the Son of God under foot, who has treated as an unholy thing the blood of the covenant that sanctified him, and who has insulted the Spirit of grace?" (Hebrews 10:26-29)
"Therefore, dear friends, since you already know this, be on your guard so that you may not be carried away by the error of lawless men and fall from your secure position." (2 Peter 3:17)
"These men are blemishes at your love feasts, eating with you without the slightest qualm--shepherds who feed only themselves. They are clouds without rain, blown along by the wind; autumn trees, without fruit and uprooted-- twice dead." (Jude 1:12)
"But Christ is faithful as a son over God's house. And we are his house, if we hold on to our courage and the hope of which we boast." (Hebrews 3:6)
I ask you this in all sincerity, for clarification:
What would it take for a person to be twice dead while he is still physically alive?
Now that was a really, really intriguing, well-written and thoughtful response -- thank you.