classic waka stream

花の色を見ても知りなむはつ霜の
心わきてはおかじとぞ思ふ
Roma-ji

Hana no iro o mite mo shirinamu hatsushimo no kokoro wakite wa okaji to zo omou

English Translation
You will know it well
when you look on the colour
of the flowers: no
first frost, I think, sets itself
with any partial intent
Meaning
You will know it when you look at the colour of the flowers: the first frost, I think, does not settle with any partiality in it.
Commentary
51 The Same Branch

From the High Priestess of Kamo to the emperor came "Onaji e o wakite shimo oku aki nareba hikari mo tsuraku omooyuru kana", and the emperor's reply was "Hana no iro o mite mo shirinamu hatsushimo no kokoro wakite wa okaji to zo omou". That is the whole of the section.
The High Priestess of Kamo was an unmarried imperial princess serving at that shrine. In the forty-ninth section the emperor's own daughter holds that office and exchanges poems with him over chrysanthemums. The emperor here is the same one.
The setting is the emperor's residence, at the moment her poem arrived.
What prompted it is her poem, "Onaji e o wakite shimo oku aki nareba hikari mo tsuraku omooyuru kana", with its complaint of partiality.
This reply closes the fifty-first section. The prose passes no judgement; the section consists of the exchange alone.

The opening says she will know it when she sees the colour of the flowers. Where she spoke of how the frost falls, he points forward to the season when the blossom comes.
What follows denies that the first frost settles with any partiality, in the grammar of what will not be so.
He takes up her own words for dividing and for settling and turns them into a denial. Answering a poem by reusing its words as an argument is the construction of the exchanges in the sixteenth and twenty-first sections.
The closing, with an emphatic particle governing the verb, pushes the judgement forward: this is what I think. He denies the partiality outright, and puts the proof of it off until the spring.
Source
Yamato Monogatari
Other