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A light bulb should go on?

Is this why Catholics believe one can lose their salvation? This is talking to the Corinthians who, although they claimed to be Christians, actually thought it was swell for their parishioners to be sleeping with their mother. Paul tells them in quite a few places to examine themselves to see if they're in the faith.

2Co 13:5-6 Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test! I hope you will find out that we have not failed the test.

Is this why Catholics believe one can lose their salvation?

This is talking to the Corinthians who, although they claimed to be Christians, actually thought it was swell for their parishioners to be sleeping with their mother. Paul tells them in quite a few places to examine themselves to see if they're in the faith.

Actually, the Apostle Paul claimed those to whom he wrote were Christians in the introduction to both epistles. The reference to the man in the earlier portion of the first epistle also applies to not associating with anyone who is designated a Christian and who is sexually immoral (pornos), covetous, an idolator, a railer/reviler/abuser, a drunkard, or a swindler/extortioner.

Paul, called to be an apostle of Jesus Christ through the will of God, and Sosthenes our brother, Unto the church of God which is at Corinth, to them that are sanctified in Christ Jesus, called to be saints, with all that in every place call upon the name of Jesus Christ our Lord, both theirs and ours: Grace be unto you, and peace, from God our Father, and from the Lord Jesus Christ. I thank my God always on your behalf, for the grace of God which is given you by Jesus Christ; That in every thing ye are enriched by him, in all utterance, and in all knowledge; Even as the testimony of Christ was confirmed in you: So that ye come behind in no gift; waiting for the coming of our Lord Jesus Christ: Who shall also confirm you unto the end, that ye may be blameless in the day of our Lord Jesus Christ.

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Paul, an apostle of Jesus Christ by the will of God, and Timothy our brother, unto the church of God which is at Corinth, with all the saints which are in all Achaia: Grace be to you and peace from God our Father, and from the Lord Jesus Christ. Blessed be God, even the Father of our Lord Jesus Christ, the Father of mercies, and the God of all comfort; Who comforteth us in all our tribulation, that we may be able to comfort them which are in any trouble, by the comfort wherewith we ourselves are comforted of God. For as the sufferings of Christ abound in us, so our consolation also aboundeth by Christ. And whether we be afflicted, it is for your consolation and salvation, which is effectual in the enduring of the same sufferings which we also suffer: or whether we be comforted, it is for your consolation and salvation. And our hope of you is stedfast, knowing, that as ye are partakers of the sufferings, so shall ye be also of the consolation.

First Corinthians, Protestant verses one to eight,

Second Corinthians, Protestant verses one to seven,

as authorized, but not authored, by King James