Yes, Proper Doctrine Is Most Certanly Required.
Proverbs 4:2 For I give you good doctrine, forsake ye not my law.
Hosea 4:6 My people are destroyed for lack of knowledge: because thou hast rejected knowledge, I will also reject thee, that thou shalt be no priest to me: seeing thou hast forgotten the law of thy God, I will also forget thy children.
Act 13:12 Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord.
Romans 16:17 Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.
John 7:16 Jesus answered them, and said, My doctrine is not mine, but his that sent me.
Ephesians 4:14 That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;
2nd John 1:9 Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
Titus 2:1 But speak thou the things which become sound doctrine:
2nd Timothy 4:3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;
2nd Timothy 4:2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
2nd Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
1st Timothy 4:16 Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee.
2nd John 1:10 If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:
Galatians 1:8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
Galatians 1:9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
The Good News!
John 7:17 If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.
James 1:5 If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him.
Those are only a few verses on the subject; but as you see, it is very important! "As he thinketh in his heart, so is he" (Pro 23:7), what you are is shaped by your doctrine.
Sincerely, Zach Doty