This episode spells out the spiritual loss incurred by believers when they adopt a legalistic approach to sanctification. The problem, according to Galatians 5:4, is that persistent appeal to the law for justification cuts the Christian off from the grace power source for sanctification. The Christian is no longer relying on the Holy Spirit and His power to walk by the Spirit (Gal. 5:16), he's now relying on works of the law for maturing in Christ. This is the fundamental error of the Galatians cited in Gal. 3:3, of whom Paul asked, "having begun by the Spirit, are you now being perfected by the flesh?" This approach to sanctification repudiates grace, resulting in being "severed from Christ" and "fallen from grace." This strong language doesn't refer to one's position in Christ, but rather to the believer's rejection of the grace of God present in sanctification. "Severed" is the translation from "katergeo" and means estrangement or made ineffective. It's the same verb in Romans 6:6, where Paul contends that the "old self might be done away with." There the old self continues to exists but is rendered ineffective. So "severed from Christ" doesn't mean the believer has lost his salvation, but he has in fact made the sanctifying grace of God ineffective by his appeal to works of the law. The result is that the believer has "fallen from grace." The grace of sanctification is available, but the believer prefers perfecting himself without it.
“Also no Salutations to Saints in Thessalonica”
On the road to answering the question regarding the omission of the word "saints" in the intro to Galatians, this episode notes that the same omission occurs in the books of 1 and 2 Thessalonians. Paul uses the words "saints" in 6 of his 9 epistles to churches. The episode notes Augustine's distinction between the visible and invisible church, and posits that Paul addressed his letters to the visible church, which included believers and unbelievers. Christ's use of the word church in Matthew 16:18 only referred to believers. "Upon this rock, I build my church." The distinction between the visible and invisible church might possibly influence how the question is ultimately answered.
“Don’t Let Persecution Go to Waste”
This episode spells out the dynamic of persecution in the lives of believers. Persecution arises because of the Word sake. (Mark 4:17) Christians have received a kingdom which cannot be shaken. (Heb. 12:28) The sovereign purpose of God in persecution is therefore the removal of things which can be shaken so that the things which cannot be shaken remain. (Heb. 12:27) So typically God allows persecution in the lives of believers to expose residual unbelief and sympathy with the kingdom of darkness (Col. 1:13). The Christian should then repent and be more committed to Christ. Amidst persecution, believers are called to identify with the sufferings and death of Christ, fully cognizant that this posture glorifies Christ, as it testifies to the veracity of the gospel. The episode finally notes that Paul was motivated to suffer for Christ because he knew Him intimately: he had "the Light of the knowledge of the glory of God in the face of Christ." (2 Cor. 4:6)