Isaiah 8:20 "To the law and to the testimony: if they speak not according to this word, it is because there is no light in them." F&W 55
This is how you tell if the doctrine you are hearing is truth or error. A very simple way to check up on what you are hearing or what you are reading or what is being acted out in front of you. If it is not according to the word of God, it is because there is no light in them.
"If it stirs up the enmity of the human heart when the Lord, the great Jehovah, is mentioned, you may know the person has no connection with God.....Now when Christ shall call forth the dead, it depends wholly upon your course of action whether you have a resurrection to life eternal or a resurrection to damnation. Thus they get these truths all mixed with error, and they cannot tell what is truth; and if asked to sit down and search the Scriptures with you to see what saith the Lord. I never knew a case but the answer was that they had no need to search the Scriptures, for the Lord told them what to do."
"The voice of God is speaking to us through His Word, and there are many voices that we will hear but Christ has said we should beware of them who will say, 'Here is Christ or there is Christ.' Then how shall we know that they have not the truth unless we bring everything to the Scriptures? Christ has warned us to beware of false prophets who will come to us in His name, saying that they are Christ. Now if you should take the position that it is not important for you to understand the Scriptures for yourselves, you will be in danger of being led away with their doctrines. Christ has said that there will be a company who in the day of retributive judgment will say, 'Lord, Lord, have we not prophesied in Thy name? and in Thy name have cast out devils? and in Thy name done many wonderful works?' But Christ will say, 'Depart from Me, ye that work iniquity'. Matthew 7:22,23 F&W 55
"The time is coming when Satan will work miracles right in your sight, claiming that he is Christ; and if your feet are not firmly established upon the truth of God, then you will be led away from your foundation. The only safety for you is to search for the truth as for hidden treasures. Dig for the truth as you would for treasures in the earth, and present the word of God, the Bible, before your heavenly Father, and say, 'Enlighten me; teach me what is truth." F&W 56
"And when His Holy Spirit shall come into your hearts, to impress the truth into your souls, you will not let go easily. You have gained such an experience in searching the Scriptures that every point is established. And it is important that you continually search the Scriptures. You should store the mind with the Word of God; for you may be separated and placed where you will not have the privilege of meeting with the children of God. Then you will want the treasures of God's Word hidden in your hearts, and when opposition comes around you, you will need to bring everything to the Scriptures." F&W 57
This is what I gained from this study. There are many voices out there and many strange doctrines that are false, but we don't have to fear because we can test everything 'to the law and to the testimony and if they don't speak according to this Word, there is no light in them. Also if we search the Scriptures daily and try to memorize as much as we are capable we will know what we believe and be able to stand up for God and His Word. Very enlightening. Grandma Joan