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This is a common problem, but only because it is poorly taught.
*When a person doubts their salvation either they have believed in something other than Jesus for God's free gift of Eternal Life. Something like actions they have done like repent of sin, being committed to God through a church they attend, being baptized, saying a sinners prayer, etc...
All these can cause a person to doubt their salvation usually revolving around sin they may have in their life.
Or they have actually believed in Jesus, but then they have let teaching that teaches something like the paragraph i wrote above
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But when a person who has actually believed in Jesus for God's free gift of Eternal Life salvation.
When they come to lose assurance of their salvation they are actually doubting God and God's promise that all who believe in Jesus become a permanent born again child of God.
I can write more but will provided a few links on assurance and also a story about assurance below the links.
Don’t Base Your Assurance on Feelings – Grace Evangelical Society
Assurance: Of the Essence of Saving Faith – Grace Evangelical Society
When Assurance of Salvation is Fleeting* – Grace Evangelical Society
Should Assurance of Salvation Be a Lifelong Struggle? – Grace Evangelical Society
J. Wilbur Chapman tells the following true story of how D.L. Moody used John 5:24 to help him gain assurance of salvation:
I was studying for the ministry, and I heard that D.L. Moody was to preach in Chicago. I went to hear him. Finally I got into his after meeting. I shall never forget the thrill that went through me when he came and sat down beside me as an inquirer. He asked me if I was a Christian. I said, “Mr. Moody, I am not sure whether I am a Christian or not.’
He very kindly took his Bible and opened it to the fifth chapter of John, and the twenty-fourth verse, which reads as follows: “Verily, verily, I say unto you, he that heareth my word, and beleiveth on Him that sent Me, hath everlasting life, and shall not come into condemnation, but is passed from death unto life.”
Suppose you had read it through for the first time, wouldn’t you think it was wonderful? I read it through, and he said, “Do you believe it?” I said, “Yes.” “Do you accept it?” I said, “Yes.” “Well, are you a Christian?”
“Mr. Moody, I sometimes think I am, and sometimes I am afraid I am not.”
He very kindly said, “Read it again.”
So I read it again, “Verily, verily, I say unto you, he that heareth my word, and beleiveth on Him that sent Me, hath everlasting life, and shall not come into condemnation, but is passed from death unto life.”Then he said, “Do you believe it?” I said, “Yes.” “Do you receive Him?” I said, “Yes.” “Well,” he said, “are you a Christian?”
I just started to say over again that sometimes I was afraid I was not, when the only time in all the years I knew him and loved him, he was sharp with me. He turned on me with his eyes flashing and said, “See here, whom are you doubting?”
Then I saw it for the first time, that when I was afraid I was not a Christian I was doubting God’s Word. I read it again with my eyes overflowing with tears.
Since that day I have had many sorrows and many joys, but never have I doubted for a moment that I was a Christian, because God said it.