Fellow believer, regardless of your current spiritual state, please know you're sanctified in Christ Jesus and forever a saint. On account of His holiness and not your own godliness, because of His perfect work on the cross and not your own faithfulness and perseverance (in good works). For it was His endurance in obedience to the Father, and His suffering for the sins of humanity, that led to our right standing with God (justification), and not the other way around — as too many scholars, theologians, pastors and teachers erroneously say, but won't acknowledge their contradicting theology (for such say we can't know that we are truly saved because one must first persevere till the end of their life in faith and good works, to be assured of eternal salvation and Heaven!).
But here's a powerful example (one of many) of divine assurance regarding our spiritual identity and security from God-breathed Scripture:
"To the assembly of God that is in Corinth, to those sanctified in Christ Jesus, called saints" (1 Corinthians 1:2a)
For in this verse, "sanctified" in Greek is in the perfect tense. This is a tense of great eternal assurance in the Greek language. It is rarely used by the writers of the New Testament, but when it is, please pay great attention to it (and look this up for yourself). For the perfect tense in this opening verse tells us, that at one point we were sanctified, and are still presently sanctified, and will remain sanctified into the future permanently. Nothing can change this because this type of sanctification (positional) was accomplished for us entirely by Jesus — when we first believed.