classic waka stream

If birds’ eggs were piled,
Ten upon ten, layered high—
Even were it so,
Would one love a person who
Does not think of him at all?

Meaning
Even if birds’ eggs could be piled ten upon ten, a hundred in all—though such a thing cannot be—would one love a person who does not think of him at all?
Commentary
50. If Birds’ Eggs Were Piled

There was a certain man. He resented a woman who reproached him, saying that he was unfaithful.
The poem was composed by the man and sent to the woman.

To pile up a hundred birds’ eggs is a metaphor for something absolutely impossible. This image is found in old Chinese expressions such as “the peril of piled eggs.”
By means of this comparison, he declares that even if what can never be done were somehow possible, he would still not love a woman who does not truly think of him.
Source
Ise Monogatari
Other