“_To the law and to the testimony_: if they speak not according to this word, it is because there is no light in them.” Isa. 8:20. NOTE.—The Bible is the test of all doctrine. Whatever does not harmonize and square with this, is not to be received. “There is but one standard of the everlastingly right and the everlastingly wrong, and that is the Bible.”—T. DE WITT TALMAGE. 5. Of what kind of doctrines should we beware? “That we henceforth be no more children, tossed to and fro, and carried about with every _wind of doctrine_.” Eph. 4:14. See also Heb. 13:9. 6. What is a “wind of doctrine”? “And the prophets shall become _wind_; and _the word is not in them_.” Jer. 5:13. NOTE.—Calling a doctrine a wind of doctrine does not make it such. That is a wind of doctrine which is not sustained by the Word of God. 7. For what is all scripture profitable? “All scripture is given by inspiration of God, and is _profitable for doctrine_.” 2 Tim. 3:16. 8. What advice was given to Timothy while preparing for the gospel ministry? “Till I come, give attendance to reading, to exhortation, to _doctrine_.... Take heed unto thyself, and unto the _doctrine_.” 1 Tim. 4:13-16. 9. What solemn charge was given him concerning his public work? “I charge thee therefore before God, and the Lord Jesus Christ, who shall judge the quick and the dead at His appearing and His kingdom; _Preach the word; ... reprove, rebuke, exhort with all long-suffering and doctrine_.” 2 Tim. 4:1, 2. 10. Why did the apostle say this duty was so imperative? “_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; _and they shall turn away their ears from the truth, and shall be turned unto fables_.” Verses 3, 4. 11. What similar instruction was given to Titus? “But speak thou the things which become _sound doctrine_: ... in all things showing thyself a pattern of good works: _in doctrine showing uncorruptness_, gravity, sincerity.” Titus 2:1-7. 12. What will sound doctrine enable the faithful teacher to do? “Holding fast the faithful word as he hath been taught, that he may be able _by sound doctrine both to exhort and to convince the gainsayers_.” Titus 1:9. 13. What danger attends the teaching of false doctrine? “Who concerning the truth have erred, saying that the resurrection is past already; and _overthrow the faith of some_.” 2 Tim. 2:18. 14. Who are the disciples of Jesus, and what gracious work does the truth do for those who receive it? “_If ye continue in My word_, then are ye My disciples indeed; and _ye shall know the truth, and the truth shall make you free_.” John 8:31, 32. 15. Through what are they to be sanctified? “Sanctify them through _Thy truth_: Thy word is truth.” John 17:17. 16. What kind of worship results from false teaching?