That [he] ne mighte bye the book,
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To copy, if him talent took.
Ther might he see, by greet tresoun,
Ful many fais comparisoun:—
"As moche as, thurgh his grete might,
Be it of hete, or of light,
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The sunne sourmounteth the mone,
That troubler is, and chaungeth sone,