Complete Classical Guitarist Book

"Every tone which is added to a beginning tone makes the meaning of that tone doubtful. If, for instance, G follows after C, the ear may not be sure whether this expresses C major or G major, or even F major or E minor; and the addition of other tones may or may not clarify this problem. In this manner there is produced a state of unrest, of imbalance which grows throughout most of the piece, and is enforced further by similar functions of the rhythm. The method by which balance is restored seems to me the real idea of the composition. [...] The tool itself may fall into disuse, but the idea behind it can never become obsolete. And therein lies the difference between a mere style and a real idea. An idea can never perish."

"He who really uses his brain for thinking can only be possessed of one desire: to resolve his task. He cannot let external conditions exert influence upon the results of his thinking. Two times two is four-whether one likes it or not. One thinks only for the sake of one's idea. And thus art can only be created for its own sake. An idea is born; it must be molded, formulated, developed, elaborated, carried through and pursued to its very end."