Sameness and difference

"When the superior scholar hears Tau, he diligently practises it. When the middling scholar hears Tau, he one while keeps it, another while loses it. When the inferior scholar hears Tau, he laughs aloud at it. Were it not thus laughed at, it would not be worthy of the name of Tau. Therefore those who have spoken (before me) have said: - "The bright in Tau are as darkness black; The advanced in Tau are as going back; And their lofty way seems a vulgar track. The highest Virtue is a lowly vale; The greatest pureness, like the vile canaille; The vastest talents, those that seem to fail. Established virtue is as stolen away; The truest essence is as foul decay; The greatest square has no angles aye. The largest vessel takes long to make; The loudest voice is what never spake; The biggest form ne'er a shape doth take." Tau is hidden, and has no name; but Tau is good at imparting and completing."