People who do not believe in the Eternal Security of the believer make a liar out of Jesus Christ.
John 6:35-40, KJV
35 And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst.
36 But I said unto you, That ye also have seen me, and believe not.
37 All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out.
38 For I came down from heaven, not to do mine own will, but the will of him that sent me.
39 And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day.
40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
John 10:27-30, KJV
27 My sheep hear my voice, and I know them, and they follow me:
28 And I give unto them eternal life; and they shall never perish, neither shall any [man] pluck them out of my hand.
29 My Father, which gave [them] me, is greater than all; and no [man] is able to pluck [them] out of my Father's hand.
30 I and [my] Father are one.
Romans 8:28-30, KJV
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.
Now if anyone does not believe these Scripture they are as the Apostle Paul stated: "Of all people most miserable." It is a mystery to me why anyone would want to refuse the teaching of these Scripture other than their ego drives them to believe they have to complete what God could not do.