classic waka stream

ことわりや曇ればこそは真澄鏡
映れる影も見えずなるらめ
Roma-ji

Kotowari ya kumoreba koso wa masukagami utsureru kage mo miezu narurame

English Translation
It is only right:
because it has clouded over
the clear mirror shows
even the image within
fading out of sight at last
Meaning
It is only natural: because it has clouded over, the image in the clear mirror can no longer be seen.
Commentary
Book Nine Miscellaneous Poems I 579

It is only reasonable, the poet says: because the mirror has clouded, even the image reflected in it can no longer be seen. Stating that it stands to reason that a clouded mirror no longer shows its image, the poem seems to hint that a clouded heart can no longer see another's true self.
The mirror also appears in poem 599 in this book as kagami no kage, where the poet laments the aging face seen in it.

First line, 'kotowari ya', means it is reasonable, the interjective ya adding feeling; the poem breaks after the first line.
Second line, 'kumoreba koso wa', means precisely because it is clouded, the particle koso answered by rame in the final line.
Third line, 'masukagami', means a clear mirror, contrasting with kumore in the second line.
Fourth line, 'utsureru kage mo', means the reflected image too, using the attributive of the continuative ri. It echoes kagami no kage in poem 599 in this book.
Final line, 'miezu narurame', means must have become invisible, rame, the realis of ramu, answering koso in the second line.
Source
Kinyo Wakashu
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