Why? Because All Scripture is Good for the Doctrine produced from the Parable of the Sower. You use Other Verses to make a point too; right?
It's Special Pleading to ask me why, without asking yourself...
Perhaps 2nd Timothy 3:16 is the foremost Fundamental Verse in the Bible. Let's use it as a Hermeneutic...
Hey, I'm going to take a break for a while...
At some point it has to be determine if it is rightly dividing the word of truth since scripture cannot go against scripture.
In John10th chapter, in verse 1 if a believer climbs up another way like seeking that baptism with the Holy Ghost by that sign of tongues rather than by believing in Jesus Christ , he is a robber and a thief and winds up following a stranger's voice as a result verse 5 ( tongues without interpretation which is just gibberish nonsense as if for private use )
Yet while His sheep follow His voice, He touched on those that went astray as His sheep because He said He
"must" bring them ( even though left behind at the pre great tribulation rapture event ) as they will be resurrected after the great tribulation to literally hear His voice as the King of kings and thus be made of the one fold & one shepherd in verse 16 for which the Lord will finish His work even in those left behind.
John 10:1Verily, 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...
5 And a stranger will they not follow, but will flee from him: for they know not the voice of strangers.
16 And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.
So there is the firstfruits, the vessels unto honor, vessels of golf & silver that departed from iniquity and they that be Christ's at His coming, the vessels unto dishonor, vessels of wood & earth, that did not depart from iniquity before the Bridegroom had come BUT still in His House.
2 Timothy 2:19 Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, let every one that nameth the name of Christ depart from iniquity.
20 But in a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honour, and some to dishonour. 21 If a man therefore purge himself from these, he shall be a vessel unto honour, sanctified, and meet for the master's use, and prepared unto every good work.
So those that do not depart from iniquity are still in His House but of a different inheritance and not of the first fold the partakers of the firstfruit of the resurrection. That is how the prodigal son is still son even though he gave up his first ineritance for wild living and can never get it back.