No, it would say "but it is not possible" if it meant "it was not possible."
Matthew: 24. 24. For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
Isaiah: 42. 1. Behold my servant, whom I uphold; mine elect, in whom my soul delighteth; I have put my spirit upon him: he shall bring forth judgment to the Gentiles. 2. He shall not cry, nor lift up, nor cause his voice to be heard in the street. 3. A bruised reed shall he not break, and the smoking flax shall he not quench: he shall bring forth judgment unto truth. 4. He shall not fail nor be discouraged, till he have set judgment in the earth: and the isles shall wait for his law. 5. Thus saith God the LORD, he that created the heavens, and stretched them out; he that spread forth the earth, and that which cometh out of it; he that giveth breath unto the people upon it, and spirit to them that walk therein: 6. I the LORD have called thee in righteousness, and will hold thine hand, and will keep thee, and give thee for a covenant of the people, for a light of the Gentiles; 7. To open the blind eyes, to bring out the prisoners from the prison, and them that sit in darkness out of the prison house.
Isaiah: 45. 1. Thus saith the LORD to his anointed, to Cyrus, whose right hand I have holden, to subdue nations before him; and I will loose the loins of kings, to open before him the two leaved gates; and the gates shall not be shut; 2. I will go before thee, and make the crooked places straight: I will break in pieces the gates of brass, and cut in sunder the bars of iron: 3. And I will give thee the treasures of darkness, and hidden riches of secret places, that thou mayest know that I, the LORD, which call thee by thy name, am the God of Israel. 4. For Jacob my servant's sake, and Israel mine elect, I have even called thee by thy name: I have surnamed thee, though thou hast not known me. 5. I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me: 6. That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else. 7. I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things. 8. Drop down, ye heavens, from above, and let the skies pour down righteousness: let the earth open, and let them bring forth salvation, and let righteousness spring up together; I the LORD have created it. 9. Woe unto him that striveth with his Maker! Let the potsherd strive with the potsherds of the earth. Shall the clay say to him that fashioneth it, What makest thou? or thy work, He hath no hands? 10. Woe unto him that saith unto his father, What begettest thou? or to the woman, What hast thou brought forth? 11. Thus saith the LORD, the Holy One of Israel, and his Maker, Ask me of things to come concerning my sons, and concerning the work of my hands command ye me. 12. I have made the earth, and created man upon it: I, even my hands, have stretched out the heavens, and all their host have I commanded. 13. I have raised him up in righteousness, and I will direct all his ways: he shall build my city, and he shall let go my captives, not for price nor reward, saith the LORD of hosts. 15. Verily thou art a God that hidest thyself, O God of Israel, the Saviour. 16. They shall be ashamed, and also confounded, all of them: they shall go to confusion together that are makers of idols. 17. But Israel shall be saved in the LORD with an everlasting salvation: ye shall not be ashamed nor confounded world without end. 18. For thus saith the LORD that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: I am the LORD; and there is none else. 19. I have not spoken in secret, in a dark place of the earth: I said not unto the seed of Jacob, Seek ye me in vain: I the LORD speak righteousness, I declare things that are right. 20. Assemble yourselves and come; draw near together, ye that are escaped of the nations: they have no knowledge that set up the wood of their graven image, and pray unto a god that cannot save. 25. In the LORD shall all the seed of Israel be justified, and shall glory.
Mark: 13. 20. And except that the Lord had shortened those days, no flesh should be saved: but for the elect's sake, whom he hath chosen, he hath shortened the days. 21. And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not: 22. For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect. 23. But take ye heed: behold, I have foretold you all things.
Luke: 18. 7. And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them? 8. I tell you that he will avenge them speedily. Nevertheless when the Son of man cometh, shall he find faith on the earth? 9. And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others: 19. And Jesus said unto him, Why callest thou me good? none is good, save one, that is, God. 27. And he said, The things which are impossible with men are possible with God.
Romans: 8. 28. And we know that all things work together for good to them that love God, to them who are the called according to his purpose. 29. For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren. 30. Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified. 31. What shall we then say to these things? If God be for us, who can be against us? 32. He that spared not his own Son, but delivered him up for us all, how shall he not with him also freely give us all things? 33. Who shall lay any thing to the charge of God's elect? It is God that justifieth. 34. Who is he that condemneth? It is Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us. 35. Who shall separate us from the love of Christ? shall tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword? 38. For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, 39. Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
I'm gonna stop so no-one gets mad about reading scripture.
Do you still think the elect and called and destined can be deceived ultimately?
I really hope not.