"The law of harmony in flourishing is the same as in love. As long as everything goes along smoothly, harmony prevails. But as soon as some rival crosses the pathway, especially in a diagonal way, there is likely to be trouble in camp. Therefore see that the lines run nearly parallel or cross nearly at right angles."
With the charm of words like these, this pleasantly old-fashioned manual inculcates a fine art that has been virtually lost: the...