Memory has been well called the store-house of our ideas. The illustration is true not only in its main feature, but in many of the minor details. The value of what a man puts away in a store-house depends much upon the order and system with which the objects are stored. The wise and thrifty merchant has bins and boxes and compartments and pigeon-holes, all arranged with due order and symmetry, and every item of goods, as it is added to his stock, is put away at once in its appropriate place, where he can lay his hands upon it whenever it is wanted. There should be a like method and system in our mental accumulations. The remembrance of facts and truths is of little value to us unless we can remember them in their connections, and can so remember them as to be able to lay our hands upon any particular thought or fact just when and where it is wanted. Many persons read and study voraciously, filling their minds most industriously with knowledge, but such a confusion of ideas prevails throughout their intellectual store-house, that their very wealth is only an embarrassment to them. The very first rule to be observed, therefore, in cultivating the memory, is to reduce our knowledge to some system. Those who are charged with the training of the young should seek not only to store their minds with ideas, but to present these ideas to them in well ordered shapes and forms, and in due logical order and coherence. Hence the peculiar value of requiring children at the proper age to commit to memory the grand formulas of Christian doctrine, on which, in every church, its wisest and ablest men have expended their strength in placing great truths in connected and logical order and dependence. The creeds and catechisms of the Christian church are among the best products of the human intellect as mere specimens of verbal statement, and are valuable, if for nothing else, as a means for exercising the memory. A child who has thoroughly mastered a good catechism has his intellectual store-house already reduced to some order and system. His mind is not the chaos that we so often find in those children who are gathered into our mission schools.