It is not an impossibility as shown in scripture. Many men are called and drawn but resist.
Matt 22:1 And Jesus answered and spake unto them again by parables, and said,
2 The kingdom of heaven is like unto a certain king, which made a marriage for his son,
3 And sent forth his servants to call them that were bidden to the wedding: and they would not come.
4 Again, he sent forth other servants, saying, Tell them which are bidden, Behold, I have prepared my dinner: my oxen and my fatlings are killed, and all things are ready: come unto the marriage.
5 But they made light of it, and went their ways, one to his farm, another to his merchandise:
6 And the remnant took his servants, and entreated them spitefully, and slew them.
7 But when the king heard thereof, he was wroth: and he sent forth his armies, and destroyed those murderers, and burned up their city.
In this parable by our Lord Jesus Christ he compares the kingdom of heaven to a marriage feast. In verses 3 and 4 he clearly states that men are called who refuse to obey and come. And in verse 7 he shows that God is angry at these persons and destroys them. So, God does not destroy men for his pleasure as some teach, he destroys them for just reasons. And at the end of this parable he says that many are called, but few chosen. This shows the chosen or elect are those who obey and come when called.
Matt 22:14 For many are called, but few are chosen.
And I will show you another story from scripture that shows just like a fisherman, some fish get away, even from the Lord.
Matt 4:19 And he saith unto them, Follow me, and I will make you fishers of men.
Every person who has ever fished knows some get away. You can hook them and be reeling them in (drawing them), but fish can fight back and often do, and many times they escape. The same with men.
Luke 5:3 And he entered into one of the ships, which was Simon's, and prayed him that he would thrust out a little from the land. And he sat down, and taught the people out of the ship.
4 Now when he had left speaking, he said unto Simon, Launch out into the deep, and let down your nets for a draught.
5 And Simon answering said unto him, Master, we have toiled all the night, and have taken nothing: nevertheless at thy word I will let down the net.
6 And when they had this done, they inclosed a great multitude of fishes: and their net brake.
This story in Luke 5 is not about fish, it is about men. It is to show us that we cannot serve the Lord in our own power, but must depend upon the Lord.
But also in this story it shows that not all men will come to Christ. These fish were caught in the net, they were drawn in, but the net burst and many escaped. Yes, many were caught, but not all.
The scriptures do not show Irresistable Grace as taught by Calvinism, they teach the opposite, that man has the ability to resist the Holy Spirit and often does.
Acts 7:51 Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.
You cannot argue that everyone who is drawn will come (well, you can, but it is error). The scriptures show many times that the Lord calls men, draws them, but they resist and will not come.
And if you argue that everyone who is drawn comes, then you cannot say that those who do not come resisted, as they were never called. If you were not invited to a wedding in the first place, you cannot say you refused the invitation.
