Doctrine and Doctrines: Doctrine means teaching or instruction. Concerning Christ Jesus we read, "And they were astonished at his [DOCTRINE]: for he [TAUGHT] them as one that had authority, and not as the scribes" (Mar 1:22.) Throughout scripture, the word doctrine is always in the singular when it describes God's doctrine (Joh 7: 16, 17; 2 Joh 1: 9; Rom 16: 17.) Usually, when the scriptures refer to man's teachings the word is in the plural (Mat. 15:9; Mar 7: 7; Col 2: 22; I Tim 4: 1; Heb 13: 9.) The doctrine of Christ is singular because no matter the subject (or where it is found in scripture) it is concerning Christ Jesus the Son of God whose person and office never changes. God's doctrine feeds the appetite Christ gives. The appetite he gives in spirit is for Christ Jesus the same yesterday and today and forever. The doctrines of men are many because they feed only the flesh of men and the appetites of men change and vary from one moment to the next.