When errors arise and are taught as Bible truth, those who have a connection with Christ will not trust to what the minister says, but like the noble Bereans, they will search the Scriptures daily to see if these things are so. When they discover what is the word of the Lord, they will take their stand on the side of the truth. They will hear the voice of the True Shepherd saying, "This is the way, walk ye in it." Thus you will be educated to make the Bible the man of your counsel, and the voice of a stranger you will neither hear nor follow.  Faith & Works, pg. 86.

If a brother is teaching error, those who are in responsible positions ought to know it; and if he is teaching truth, they ought to take their stand at his side. We should all know what is being taught among us; for if it is truth, we need to know it. The Sabbath school teacher needs to know it, and every Sabbath school scholar ought to understand it. We are all under obligation to God to understand what He sends us. He has given directions by which we may test every doctrine--"To the law and to the testimony: if they speak not according to this word, it is because there is no light in them." But if it is according to this test, do not be so full of prejudice that you cannot acknowledge a point simply because it does not agree with your ideas.  Testimonies to Ministers and Gospel Workers, page 110.

So it was with the heresies taught in Living Temple. [* A BOOK EXPRESSING PANTHEISTIC SENTIMENTS PUBLISHED BY J. H. KELLOGG.] The subtle errors in this book were surrounded by many beautiful truths. . . . The seductive fallacies of Satan undermined confidence in the true pillars of the faith, which are grounded on Bible evidence. Truth is sustained by a plain "Thus saith the Lord." But there has been a weaving in of error, and the use of scriptures out of their natural connection, in order to substantiate fallacies, which would deceive, if possible, the very elect. . . . This Day with God, page 126

False teachers may appear to be very zealous for the work of God, and may expend means to bring their theories before the world and the church; but as they mingle error with truth, their message is one of deception, and will lead souls into false paths. They are to be met and opposed, not because they are bad men, but because they are teachers of falsehood and are endeavoring to put upon falsehood the stamp of truth.  TM-55. 

It is when Satan appears as an angel of light that he takes souls in his snare, deceiving them.  Men who pretend to have been taught of God, will adopt fallacious theories, and in their teaching will so adorn these fallacies as to bring in Satanic delusions.  Thus Satan will be introduced as an angel of light and will have opportunity to present his pleasing fables. These false prophets will have to be met.  They will make an effort to deceive many, by leading them to accept false theories.  Many scriptures will be misapplied in such a way that deceptive theories will apparently be based upon the words that God has spoken.  Precious truth will be appropriated to substantiate and establish error.  These false prophets, who claim to be taught of God, will take beautiful scriptures that have been given to adorn the truth, and will use them as a robe of righteousness to cover false and dangerous theories.  And even some of those who, in times past, the Lord has honored, will depart so far from the truth as to advocate misleading theories regarding many phases of truth, including the sanctuary question. Manuscript 11, 1906, Evangelism– 360. 

Christ never made peace by anything like compromise. The hearts of God's servants will overflow with love and sympathy for the erring, as represented by the parable of the lost sheep; but they will have no soft words for sin. They show the truest friendship who reprove error and sin without partiality and without hypocrisy. Jesus lived in the midst of a sinful and perverse generation. He could not be at peace with the world unless He left them unwarned, unreproved, and this would not be in accordance with the plan of salvation.-- Letter 12, 1890. Evangelism, pg. 368. 

To substitute external forms of religion for holiness of heart and life is still as pleasing to the unrenewed nature as it was in the days of these Jewish teachers. Today, as then, there are false spiritual guides, to whose doctrines many listen eagerly. It is Satan's studied effort to divert minds from the hope of salvation through faith in Christ and obedience to the law of God. In every age the archenemy adapts his temptations to the prejudices or inclinations of those whom he is seeking to deceive. In apostolic times he led the Jews to exalt the ceremonial law and reject Christ; at the present time he induces many professing Christians, under pretense of honoring Christ, to cast contempt on the moral law and to teach that its precepts may be transgressed with impunity. It is the duty of every servant of God to withstand firmly and decidedly these perverters of the faith and by the word of truth fearlessly to expose their errors.  AA 387.