classic waka stream

また来むと誰にもえこそ言ひおかね
心にかなふ命ならねば
Roma-ji

Mata komu to tare ni mo e koso iiokane kokoro ni kanau inochi naraneba

English Translation
That I will return
I cannot bring myself to
promise anyone,
for this life of mine is not
a thing that bends to my will.
Meaning
I cannot bring myself to promise anyone that I will come back again, for life is not something that goes as one's heart would wish.
Commentary
Book Six Parting Poems 180

A poem from the side of the one departing, voicing a heart that cannot promise a reunion. Since life does not obey one's wishes, the speaker cannot tell anyone that they will surely return, and a sense of impermanence, felt anew at every parting, seeps through.

First line, "mata komu to": the volitional "mu" gives the words of a promise to come back again.
Second line, "tare ni mo e koso": "e" with a negative expresses impossibility, and "koso" agrees with "okane" in the third line.
Third line, "iiokane": "ne" is the negative "zu" in the form concluding "koso," meaning "cannot leave word." The poem breaks after this line.
Fourth line, "kokoro ni kanau," means to go as one wishes.
Final line, "inochi naraneba" (since life is not), gives in inverted order the reason one cannot speak. The next poem, 181, ends in the same form, "sumika naraneba," so two poems that rest on the uncertainty of life and dwelling stand side by side.
Source
Shika Wakashu
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