When differences are fundamental and therefore unavoidable, they will become more pronounced under test than at any other time. If, during an epidemic, a physician believes that the method of treatment employed by another doctor is actually killing the patients, his opposition to such a method will then he stronger than at any other time. As long as that method is simply a theory, it is harmless. Only when put into practise does it become dangerous. It is a matter of common knowledge that evangelical Christians are not driven further apart but are really driven together whenever Christianity itself is placed under any special trial, as, for example, in foreign missionary work in heathen lands. And even in our own country, whenever a great local interest is taken in the work of soul-saving there is a corresponding tendency for Christians of different sects to ignore their differences of opinion and get together as if they believed in a common Lord over all and were all members of the same family. Thus, whenever the high tide of evangelism comes in, the landmarks of sects are scarcely visible; but whenever the tide goes out, behold, _the ancient boundaries of sects appear as before_. This fact proves that there are no fundamental reasons why sects should exist. It proves that in reality sects are a barrier to the true work of Christ; hence are, in their essential nature, antichristian. What, then, is the real cause of sects'? Traced to the original source, modern sects, we find, originated where the papacy originated--in the corruption of Christianity in the early centuries. All came from the same roots of error. [Sidenote: True causes of sects] However modified and diversified in external form and in doctrinal teaching they may now be, they exhibit in their ecclesiastical constitutions a foreign character derived from the foreign stock from which they sprang. Into this system there have been engrafted many noble scions of truth from the "good olive-tree," and these have produced commendable fruits of righteousness. But we are here concerned with pointing out those fundamental characteristics of the system that are foreign to the true church of Jesus Christ. [Sidenote: Erroneous ideas of the church]