"That you may show yourselves to be blameless and guiltless, innocent and uncontaminated, children of God without blemish (faultless, unrebukable) in the midst of a crooked and wicked generation [spiritually perverted and perverse], among whom you are seen as bright lights (stars or beacons shining out clearly) in the [dark] world..." - Philippians 2:15
"And those whom He thus foreordained, He also called; and those whom He called, He also justified (acquitted, made righteous, putting them into right standing with Himself). And those whom He justified, He also glorified [raising them to a heavenly dignity and condition or state of being]." - Romans 8:30
Jesus reveals to the Apostle John messages to seven local churches in Asia Minor of that time. All seven were in close proximity to each other. Each is also representative of a particular age in church history. Jesus takes these churches existing at that time and compares their condition spiritually to seven church epochs yet to appear in church history. The Lord is, by way of these seven church conditions, writing through the Apostle John, church history for the future.
There is only one totally unpardonable sin. It is a sin in which the heart has been wilfully hardened until it cannot be softened so that sin may be forgiven; the Holy Spirit has been "quenched". It has become blasphemy against the Holy Spirit. He cannot penetrate the hardness, and will not strive any more (1 Thessalonians 5:19).