Some persons have contended that mathematics ought to be taught by making the illustrations obvious to the senses. Nothing can be more absurd or injurious: it ought to be our never-ceasing effort to make people think, not feel.
Nature is a wary wily long-breathed old Witch, tough-lived as a Turtle and divisible as the Polyp, repullulative in a thousand Snips and Cuttings, integra et in toto! She is sure to get the better of Lady MIND in the long run, and to take her revenge too transforms our To Day into a Canvass dead-colored to receive the dull featureless Portait of Yesterday.
It is saying less than the truth to affirm that an excellent book (and the remark holds almost equally good of a Raphael as of a Milton) is like a well-chosen and well-tended fruit tree. Its fruits are not of one season only. With the due and natural intervals, we may recur to it year after year, and it will supply the same nourishment and the same gratification, if only we ourselves return to it with the same healthful appetite.