It is not very difficult to discern the wisdom of God in introducing truth in such a manner. If every species of plants and flowers were to grow together, instead of the whole being scattered over the earth, the effect would be very different, and must for the worse; and if all truth relating to one subject were to be found in only one book, chapter, or epistle, we should probably understand much less than we do. There are some Divine truths which are less pleasant than others. Even good men have their partialities, or favourite principles, which would induce them to read those parts of Scripture which favoured them, to the neglect of others. But truth being scattered throughout the Scriptures, we are thereby necessitated, if we read at all, to read the whole mind of God; and thus it is that we gradually and insensibly imbibe it, and become assimilated to the same image. The conduct of God in this matter resembles that of a wise physician, who, in prescribing for a child, directs that its medicines be mixed up with its necessary food.
Andrew Fuller, The Complete Works of Andrew Fuller, 539-40