What is your understanding? I'm not talking here about enduring to the end, but are we saved as long as we have the Holy Spirit? So please don't make this into a OSAS debate. God bless!
Romans 8:9
"However, you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. But if anyone does not have the Spirit of Christ, he does not belong to Him."
Ok, being in the Spirit means you have the Holy Spirit and Romans 8:9 says if you don't have the Holy Spirit you aren't saved, but it doesn't say that if you have the Holy Spirit you are. On the contrary reading Romans 8:12-13 it seems having the Spirit is not equal with being saved if we not live by the Spirit.
"So then, brethren, we are under obligation, not to the flesh, to live according to the flesh-- for if you are living according to the flesh, you must die; but if by the Spirit you are putting to death the deeds of the body, you will live."