#10. Clear and Related Knowledge.#--But the teacher should know in a more connected and also in a more detailed way the truths of the Book. The pupil's knowledge should be _clear_, by which one means that he should know a thing and not some other thing in its stead; and a teacher's knowledge should be not only clear but _related_, by which one means that he should know a thing in its relation to all other things with which it is vitally connected. This makes for system in knowledge, and gives the teacher the power to teach each fact with its due emphasis, no more and no less. Some writers on education call this kind of knowing _apperception_, by which they mean seeing a thing in its proper system and in its due relations. To say that Jesus was born in Bethlehem, that he lived in Nazareth, that he was crucified on Calvary, and that he arose from the dead on the third day, as he said he would, is clear knowledge. To see Jesus as the fulfilment of prophecy, as the promised King, as the leader of his people, as a teacher with more than human insight, as the founder of a church, and as the pattern and perfection of all endeavor, is _related_ knowledge; it is seeing Jesus as part of a great system of purpose that swept into time by the will of God. #11.# It is well also for the teacher to possess #adequate# knowledge; he should be able to separate a fact into its parts; that is, analyze it. This analytic power makes for vivid teaching but it is a power that the pupil in his early years cannot acquire. Only the mature mind is analytic, and the teacher who knows how to analyze a fact or a lesson knows the secret of proportion in teaching, the power to know what to make emphatic, what to make subordinate. It is a poor teacher who is unable to distinguish between a vital element and a non-vital element. #12. Related Subjects.#--The teacher should also know such related subjects as will best enable him to make clear each point under treatment in the lesson. A teacher should have a working knowledge of biblical geography and of sacred antiquities. He should know how to use a concordance, how to work up cross-references, how to interpret peculiar idioms, and in general how to use the text of the Bible in the most effective manner. He should know the general principles of organization pursued in a modern Sunday-school, together with the outlines of the history of the church, and should have a general knowledge of the translations of the Bible into the English language.