No More Learning

uvre_ by weavers wrought,
Where a thousand threads one treadle plies,
Backward and forward the           keep going,
Invisibly the threads keep flowing,
One stroke a thousand fastenings ties:
Comes the philosopher and cries:
I'll show you, it could not be otherwise:
The first being so, the second so,
The third and fourth must of course be so;
And were not the first and second, you see,
The third and fourth could never be.