Matthew 23:8

“But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.”

King James Version (KJV)

doctrine(n.)

Oxford English Dictionary page 781: TO TEACH OR INSTRUCT A PERSON in (given subject, ex: science, etc)

late 14c., "the body of principles, dogmas, etc., in a religion or field of knowledge," from Old French doctrine (12c.) "teaching, doctrine" and directly from Latin doctrina "a teaching, body of teachings, learning," from doctor "teacher" (see doctor (n.)) + -ina, fem. of -inus, suffix forming fem. abstract nouns (see -ine (1)).

The notion is "whatever is taught or laid down as true by a master or instructor," hence "any set of principles held as true."

Matthew 23:8 “But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.” King James Version (KJV) doctrine(n.) late 14c., "the body of principles, dogmas, etc., in a religion or field of knowledge," from Old French doctrine (12c.) "teaching, doctrine" and directly from Latin doctrina "a teaching, body of teachings, learning," from doctor "teacher"

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