| Quote #4
'Of al hir art ne counte I noght a tare.'
"Art" here refers to book-learning, and again, the miller is declaring it valueless. A "tare" is a kind of weed, considered worthless.
| Quote #5
He seyde, 'I trowe the clerkes were aferd
Symkyn declares that his clever ruse proves that a miller can "make a clerkes beard," or trick a clerk, demonstrating that he views this conflict to be one between millers and clerks, rather than just between him and these particular clerks.
| Quote #6
'Alas,' quod John, 'the day that I was born!
John basically admits here that he does view his ability to prevent Symkyn from cheating him as somehow indicative of his intelligence. Now that Symkyn has cheated them, he fears that his school friends and the warden will call him a fool. What hurts the most, however, is that the miller will call him a fool.