I have often been surprised that Mathematics, the quintessence of Truth, should have found admirers so few and so languid. Frequent consideration and… - Samuel Taylor Coleridge

In Xanadu did Kubla Khan A stately pleasure-dome decree: Where Alph, the sacred river, ran Through caverns measureless to man Down to a sunless sea.

Visit her, gentle Sleep! with wings of healing,

And may this storm be but a mountain-birth,

May all the stars hang bright above her dwelling,

Silent as though they watched the sleeping Earth!

With light heart may she rise,

Gay fancy, cheerful eyes,

Joy lift her spirit, joy attune her voice;

To her may all things live, from pole to pole,

Their life the eddying of her living soul!

O simple spirit, guided from above,

Dear Lady! friend devoutest of my choice,

Thus mayest thou ever, evermore rejoice.

The reader should be carried forward, not merely or chiefly by the mechanical impulse of curiosity, or by a restless desire to arrive at the final solution; but by the pleasurable activity of mind excited by the attractions of the journey itself.