Ministers should be guarded, lest they thwart the purposes of God by plans of their own. They are in danger of narrowing down the work of God, and confining their labor to certain localities, and not cultivating a special interest for the work of God in all its various departments. There are some who concentrate their minds upon one subject to the exclusion of others which may be of equal importance. They are one-idea men. All the strength of their being is concentrated on the subject upon which the mind is exercised for the time. Every other consideration is lost sight of. This one favorite theme is the burden of their thoughts and the theme of their conversation. All the evidence which has a bearing upon that subject is eagerly seized and appropriated, and dwelt upon at so great length that minds are wearied in following them. (3T 34.1) MC VC

Time is frequently lost in explaining points which are really unimportant, and which would be taken for granted without producing proof; for they are self-evident. But the real, vital points should be made as plain and forcible as language and proof can make them. The power to concentrate the mind upon one subject to the exclusion of all others is well in a degree; but the constant exercise of this faculty wears upon those organs that are called into use to do this work; it throws too great a tax upon them, and the result is a failure to accomplish the greatest amount of good. The principal wear comes upon one set of organs, while the others lie dormant. The mind cannot thus be healthfully exercised, and, in consequence, life is shortened. (3T 34.2) MC VC

All the faculties should bear a part of the labor, working harmoniously, balancing one another. Those who put the whole strength of their mind into one subject are greatly deficient on other points, for the reason that the faculties are not equally cultivated. The subject before them enchains their attention, and they are led on and on, and go deeper and deeper into the matter. They see knowledge and light as they become interested and absorbed. But there are very few minds that can follow them unless they have given the subject the same depth of thought. There is danger of such men plowing, and planting the seed of truth so deep that the tender, precious blade will never find the surface. (3T 34.3) MC VC