Some individuals are unteachable by God Himself and by His Word, the Bible. They are also unteachable by the representatives God gives them, prophets, priests, pastors, teachers, evangelists etc. At the first they cannot be taught because they are not willing to be taught. And then many reach a point where they have adamantly and finally refused to be taught by the Lord or His Word. They have finally and completely rejected the Lord Jesus, His forgiveness and His corrective work in their hearts and lives. At that point their unwillingness to be taught becomes a judgmental and eternally fixed inability. There is no hope for them to ever be saved.
Isaiah 55:6: Seek ye the LORD while he may be found, call ye upon him while he is near:
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.
No one will ever have a good excuse for refusing to be taught by God.
Romans 1:20: For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
Being unteachable is at the first a choice made by foolish men. When they are unteachable too firmly and too long, He gives them up.
2 Chronicles 30:7: And be not ye like your fathers, and like your brethren, which trespassed against the LORD God of their fathers, who therefore gave them up to desolation, as ye see.
Romans 1:24, 26, 28: Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves: 26: For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: 28 And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
Even after they receive Jesus, there are many individuals who walk in the flesh. Some walk in the flesh immediately after receiving Jesus. I often wonder if they have truly received Him. Some walk in the flesh for years or even decades but then give evidence that they have become teachable. Some seem to be teachable for a time after they receive Jesus but later stop giving evidence that they have Him. The ones who make false professions of faith do not have the Holy Spirit and the evidence they give is false and usually temporary. Some who sincerely receive Jesus do have the Holy Spirit but they grieve Him and quench Him. They are often loveless, joyless and without peace. They do not bear the fruit of the Spirit. Quenching Him quenches His fruit.
Ephesians 4:30: And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
1 Thessalonians 5:19: Quench not the Spirit.
Galatians 5:22a: But the fruit of the Spirit is love, joy, peace, . . .
2 Thessalonians 2:7-12: For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way. (the Holy Spirit) 8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming: 9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders, 10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. 11 And for this cause God shall send them strong delusion, that they should believe a lie: 12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
If you are hearing this or reading this, it is not too late for you to receive Jesus. If you have received Him and have been quenching and grieving the Holy Spirit, it is not too late to become teachable.