I shall be telling this with a sigh
Somewhere ages and ages hence:

from Robert Frost – The Road Not Taken on Rap Genius

Meaning

As he accepts that this choice may ultimately define his life, he expects to feel a little melancholy about his decision. He is not completely confident and expects to feel some regrets that he didn’t go the other way. The tone here is gently comic or mock-melodramatic, but there’s a serious wistfulness behind it.

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