The Hebrew word for doctrine means "to take, receive, seize"; then it means that which is received mentally: instruction. The Greek has a whole family of words relating to our topic: one means that which is taught; another refers to the one doing the teaching, the doctor or master; the verb form simply means to instruct or indoctrinate. The word doctrine appears fifty-two times in scripture, good evidence of its importance. Strikingly, when we read of doctrines in the plural the reference is always to strange doctrines, the doctrines of men, or the doctrines of devils. False doctrines are legion and contradictory, but true doctrine is one, for it has its unity in Jesus Christ.
The doctrine of God drops from heaven as rain (Deut. 32:2), it is pure and good (Job 11:4). The people were amazed at the teaching of Jesus, saying, "What thing is this? What new doctrine is this? For with authority commandeth he . . ." (Mark 1:27). But Jesus did not teach new doctrine; it was not his but the Father's, and it agreed with the teaching of Moses (John 7:16–19). The children of God obey from the heart that form of doctrine which was delivered unto them (Rom. 6:17). Since all scripture is given by inspiration of God, it has the primary profit of giving us doctrine (2 Tim. 3:16). Adding to the peril of the times in which we live is the fact that men "will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers; having itching ears" (2 Tim. 4:3). The purpose of God in giving ministers to the church is "that henceforth we be no more children, tossed to and fro, and carried about with every wind of doctrine . . ." (Eph. 4:14). Of such central importance is the truth that Jesus Christ, the Son of God, is come in the flesh that the denial of this is antichrist, and "if there come any unto you and bring not this doctrine, receive him not into your house, neither bid him God speed" (2 John 10).