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or even Quadrillions, of ideas pass through the mind in the space of twenty-four hours, everyone of those ideas must belong to one of "three," classes, given below:—
CLASSES OF IDEAS.
The first class, is the Familiar, or that which is known; the second class is the less familiar, or that which is not known so well; the third class is the unfamiliar, or that which is not known. Now, no matter what may have been your previous belief relative to the multiplicity of the classes of ideas, I think that from the above short analysis, that it is clear these are the only classes of ideas that it is possible for us to have; it must either be something that we do know, something that we do not know so well, or something that we do not know. There is such a close analogy between the first and second class of ideas, that we may for all practical purposes treat them as one class; thus, we shall have merely to deal with two classes of ideas, viz:—the familiar, and the unfamiliar.
Now, as every idea that you have must belong to one of these classes—that is to say, must either be familiar or unfamiliar—whenever you wish to commit anything to memory you should firstly try to find "to which class does that idea belong," for, if you do so, you will then be able to determine which principle it is necessary to use. If you find that your
