The New Testament makes strong statements about the security of believers. John 10:28–29 is among the most direct: "I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand." Never perish — the Greek is ou me apollymi, a double negative, the strongest negation available in Greek grammar. The security is not contingent on your performance. It is secured by his grip.
Romans 8:38–39 lists every category of power and being that might threaten to separate a believer from God's love — and concludes none of them can. Hebrews 7:25 says Jesus "ever liveth to make intercession" for those who come to God through him. He is actively, continuously, currently sustaining your relationship with the Father. Assurance is not something you manufacture by examining your own feelings. It is grounded in his ongoing work on your behalf.
The pastoral complication is that for some people, the question "am I saved?" is not a question they ask once and resolve. It recurs compulsively, every reassurance lasts only hours, no amount of scriptural evidence settles it, and the seeking of certainty becomes its own trap. That pattern — intrusive, repetitive, relief-seeking followed by renewed doubt — is the signature of OCD, specifically its religious form. Reassurance-seeking for OCD temporarily reduces anxiety but ultimately strengthens the cycle. Theology can resolve a theological question. It cannot resolve a brain function that will immediately reapply the same doubt to the new answer.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.