God don't make no mudpies.
Phl 1:6 Being confident of this very thing, that he which hath begun a good work in you will perform [it] until the day of Jesus Christ:
God is the authur and finisher of our faith.He would not be sovereign if once he brought you to faith through his Grace he allowed you to be lost.
>1 Cor 10...Wherefore he that thinketh himself to stand, let him take heed lest he fall.<
You need to read this chapter for context.It in no way refers to loosing ones salvation.It is actually a warning that Christians are still subject to sins of the flesh and should guard against conceit.
You should have read all of Hebrews Chapter 6.
Hbr 6:19 Which [hope] we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;
We have a hope that will endureth until we see the father(He resides behind the Veil)
Now, the verses I posted can not be simply excised from Holy Writ because they do not fit the oral protestant tradition.