The sheep were those He chose from the foundation of the world. Sheep are sheep because He chose them beforehand...they did not become sheep when they believed...
Joh 10:9 I am the door: by me
if any man enter in, he shall be saved, and shall go in and out, and find pasture.
Joh 10:11 I am the good shepherd: the good shepherd giveth his life for the sheep.
Joh 10:14 I am the good shepherd, and know my sheep, and am known of mine.
Joh 10:26 But ye believe not, because ye are not of my sheep, as I said unto you.
--Note: The sheep are the ones that believe. He makes that differentiation here.
Joh 10:27 My sheep hear my voice, and I know them, and they follow me:
Joh 10:28 And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
Joh 10:29 My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand.
Joh 10:30 I and my Father are one.
--Note all the privileges of the sheep. These are the same privileges that are given "to them that believe on his name." That is no coincidence.
Joh 10:37 If I do not the works of my Father, believe me not.
Joh 10:38 But if I do, though ye believe not me, believe the works: that ye may know, and believe, that the Father is in me, and I in him.
--Those that do not believe are not among his sheep; those that do believe are his sheep.
Sometimes there are pretenders. They try to get in some other way. But there is only one way.
Joh 10:1 Verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber.
--That way is through Christ--through faith in his shed blood. There is no other way. Christ is the door. One must actively enter, by faith, through that door. He is not elected to go through that door. He must by faith enter the door. He chooses whether or not to go through that door.
Then said Jesus unto them again, Verily, verily, I say unto you,
I am the door of the sheep. All that ever came before me are thieves and robbers: but the sheep did not hear them.
I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture.
(Joh 10:7-9)
--The question is: Have you entered in, or are you depending somehow on your "election"?