1 Now the Spirit expressly says that in latter times some will depart from the faith, giving heed to deceiving spirits and doctrines of demons, 2 speaking lies in hypocrisy, having their own conscience seared with a hot iron, 3 forbidding to marry, and commanding to abstain from foods which God created to be received with thanksgiving by those who believe and know the truth. (1 Timothy 4:1–3, NKJV)
In sharp contrast to Calvinism’s “perseverance of the saints” doctrine (a.k.a. “once saved, always saved” and the impossibility of apostasy), the Spirit of God explicitly says some Christians would “depart from the faith” (v. 1). One cannot depart from that of which he was never a part. They would depart “the faith” – the gospel revealed by Christ and preached by His apostles (Gal. 1:11-12, 23). Jesus described those who “in time of temptation fall away” (Lk. 8:13). Paul warned those who had “fallen from grace” (Gal. 5:4). He also spoke of “the falling away” to console those who thought Christ was soon to appear (2 Thess. 2:3). Why reject this obvious Bible truth? It has nothing to do with God’s ability to save, and everything to do with our faith. We must hear and follow the word of Jesus to be secure in Him (Jno. 10:27-30; Heb. 5:8-9; Matt. 7:21-23). False doctrines (like once saved, always saved) deceive people of their security when they are in spiritual danger. Error sears consciences to prevent us from believing and receiving the truth (v. 3). You can know whether you have departed from the faith by comparing yourself to the truth. We are secure in Christ when we believe and walk in the faith.