1 Corinthians 9:27 but I punish my body and enslave it, so that after proclaiming to others I myself should not be disqualified.
2 Timothy 2:12 if we endure, we will also reign with him; if we deny him, he will also deny us;
Philippians 2:12 Therefore, my beloved, just as you have always obeyed me, not only in my presence, but much more now in my absence, work out your own salvation with fear and trembling; 13 for it is God who is at work in you, enabling you both to will and to work for his good pleasure.
What we have is context.
Paul isn't going to say in one place salvation is lost....though that isn't what those passages say, and then in another place say we don't lose salvation.
One has to read the verses in context to understand their meaning.
What Catholics fail to realize is that there’s a difference between salvation and rewards.
Salvation is secure in Christ. As pointed out, we are sealed until the day of redemption by the Holy Spirit who is given to us as the guarantee of our inheritance until we acquire possession of it.
However rewards are gained or lost for faithful service and sold winning for example.
John 5:24 Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.
John 6:37-39 All that the Father gives me will come to me, and whoever comes to me I will never cast out. For I have come down from heaven, not to do my own will but the will of him who sent me. And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day.
John 10:25-30 Jesus answered them, “I told you, and you do not believe. The works that I do in my Father's name bear witness about me, but you do not believe because you are not among my sheep. My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father's hand. I and the Father are one.”
Romans 4:16 Therefore, the promise comes by faith, so that it may be by grace and may be guaranteed to all Abraham's offspring-not only to those who are of the law but also to those who have the faith of Abraham. He is the father of us all.
1 Corinthians 1:4-8 I give thanks to my God always for you because of the grace of God that was given you in Christ Jesus,that in every way you were enriched in him in all speech and all knowledge—even as the testimony about Christ was confirmed among you—so that you are not lacking in any gift, as you wait for the revealing of our Lord Jesus Christ, who will sustain you to the end, guiltless in the day of our Lord Jesus Christ.
2 Corinthians 1:21-22 And it is God who establishes us with you in Christ, and has anointed us, and who has also put his seal on us and given us his Spirit in our hearts as a guarantee.
2 Corinthians 5:4-8 For while we are still in this tent, we groan, being burdened—not that we would be unclothed, but that we would be further clothed, so that what is mortal may be swallowed up by life. He who has prepared us for this very thing is God, who has given us the Spirit as a guarantee.
So we are always of good courage. We know that while we are at home in the body we are away from the Lord, for we walk by faith, not by sight. Yes, we are of good courage, and we would rather be away from the body and at home with the Lord.
Ephesians 1:13-14 In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, who is the guarantee of our inheritanceuntil we acquire possession of it, to the praise of his glory.
Ephesians 4:30 And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption.
Philippians 1:6 And I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ.
Colossians 1:13-14 He has delivered us from the domain of darkness and transferred us to the kingdom of his beloved Son, in whom we have redemption, the forgiveness of sins.
Colossians 2:13-14 And you, who were dead in your trespasses and the uncircumcision of your flesh, God made alive together with him, having forgiven us all our trespasses, by canceling the record of debt that stood against us with its legal demands. This he set aside, nailing it to the cross.
Colossians 3:3 For you have died, and your life is hidden with Christ in God. When Christ who is your life appears, then you also will appear with him in glory.
1 Peter 1:3-5 Blessed be the God and Father of our Lord Jesus Christ! According to his great mercy, he has caused us to be born again to a living hope through the resurrection of Jesus Christ from the dead, to an inheritance that is imperishable, undefiled, and unfading, kept in heaven for you, who by God's power are being guarded through faith for a salvation ready to be revealed in the last time.
Hebrews 6:17-20 So when God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he guaranteed it with an oath, so that by two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement to hold fast to the hope set before us. We have this as a sure and steadfast anchor of the soul, a hope that enters into the inner place behind the curtain, where Jesus has gone as a forerunner on our behalf, having become a high priest forever after the order of Melchizedek.
Jude v24 "Now unto Him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy"
1 John 5:13 I write these things to you who believe in the name of the Son of God that you may know that you have eternal life.
http://www.freerepublic.com/focus/religion/3156607/posts?page=313#313
2 Corinthians 1:21-22 Now he which stablisheth us with you in Christ, and hath anointed us, is God; Who hath also sealed us, and given the earnest of the Spirit in our hearts.
For which the Greek, from the Byzantine, is:
2Corinthians 1:21-22 ο δε βεβαιων ημας συν υμιν εις χριστον και χρισας ημας θεος ο και σφραγισαμενος ημας και δους τον αρραβωνα του πνευματος εν ταις καρδιαις ημων
The first word in bold above is “bebaion,” the idea of confirmation, frequently used in commercial settings to confirm a bargain. Which of course makes sense of the remaining terms used here, which are also elements of a secured contract.
The second word in bold above is “sphragisamenos,” being sealed is to be marked by the signature, signet ring, or other unique proof of identity, that we belong to God, and this sealing is done by God, who is the one taking action in this verse. We do not and cannot seal ourselves. We do not, by our own powers, have access to God’s “signet ring.”
The third bolded word above is “arrabona,” and indicates what we might loosely refer to as earnest money, but in Hebrew culture conveys more the idea of a pledge of covenant, a security given as a guarantee that the deal will go through, though we only receive part payment at the beginning. See ערב for the related Hebrew stem indicating “pledge.”