I believe the Bible does advise that one can throw away salvation.
Here is where I get this idea:
(Ezekiel 18:21-24 NIV)  "But if a wicked man turns away from all the sins he has committed and keeps all my decrees and does what is just and right, he will surely live; he will not die.  None of the offenses he has committed will be remembered against him. Because of the righteous things he has done, he will live.  Do I take any pleasure in the death of the wicked? declares the Sovereign LORD. Rather, am I not pleased when they turn from their ways and live?
 "But if a righteous man turns from his righteousness and commits sin and does the same detestable things the wicked man does, will he live? None of the righteous things he has done will be remembered. Because of the unfaithfulness he is guilty of and because of the sins he has committed, he will die.
(Matthew 24:10-13 NIV)  At that time many will turn away from the faith and will betray and hate each other,  and many false prophets will appear and deceive many people.  Because of the increase of wickedness, the love of most will grow cold,  but he who stands firm to the end will be saved.
(1 Timothy 1:18-19 NIV)  Timothy, my son, I give you this instruction in keeping with the prophecies once made about you, so that by following them you may fight the good fight,  holding on to faith and a good conscience. Some have rejected these and so have shipwrecked their faith.
(1 Timothy 6:20-21 NIV)  Timothy, guard what has been entrusted to your care. Turn away from godless chatter and the opposing ideas of what is falsely called knowledge,  which some have professed and in so doing have wandered from the faith. Grace be with you.
(2 Peter 3:17 NIV) 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.
(John 15:6 NIV) If anyone does not remain in me, he is like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned.
Oh, sorry I mis-understood your point a few posts up. I apologize.
I know there are scriptures that insinuate that a person can lose their salvation. Within Christiandom, there are different views concerning Soteriology. Some believe you can lose it because you got it yourself and others feel that since you had nothing to do with it, you cannot lose it and that God will cause you to grow in Holiness whereby you will see Him. I could give you my views on the scriptures you posted, but I think I'll do that another time? For now, I just wanted to say thanks for the apology. Dont sweat it!