I would counter this by several things.
- The verse says nothing about eternal security and once saved always saved. Moreover, in the same letter Paul says, “Be sure of this, that no fornicator or impure man, or one who is covetous (that is, an idolater), has any inheritance in the kingdom of Christ and of God. Let no one deceive you with empty words, for it is because of these things that the wrath of God comes upon the sons of disobedience.”[Ephesians 5: 5-6]
Likewise Paul says in Eph 4:30-32 “And do not grieve the Holy Spirit of God, in whom you were sealed for the day of redemption. Let all bitterness and wrath and anger and clamor and slander be put away from you, with all malice, and be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you.”
The book of Hebrews says this about grieving the Holy Spirit:
Hebrews 10: 26-31
For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a fearful prospect of judgment, and a fury of fire which will consume the adversaries. A man who has violated the law of Moses dies without mercy at the testimony of two or three witnesses. How much worse punishment do you think will be deserved by the man who has spurned the Son of God, and profaned the blood of the covenant by which he was sanctified, and outraged the Spirit of grace? For we know him who said, “Vengeance is mine, I will repay.” And again, “The Lord will judge his people.” It is a fearful thing to fall into the hands of the living God."
I could show many other verses where Paul says that sin leads to death and he even names the sins. So Paul is warning those that are sealed not to sin because sin leads to death and condemnation. I can list verse after verse that shows these things from his letters.
I have researched over 60 passages of scripture that deny OSAS. If you want these send me a PM with your email address and I will send them to you.
Read the book of Revelation and you will quickly notice that the seven churches are given major league warnings concerning their fate if they do not change their sinful ways. Moreover, we are told over and over that “those that conquer” will receive eternal life. If OSAS were true none of these kinds of things would be stated in the book of Revelation.
Read 2 Peter 2:20-22…the passage absolutely trashes OSAS.