I could not fix the year

A Thought Went Up My Mind To-Day
Emily Dickinson

A thought went up my mind to-day
That I have had before,
But did not finish,--some way back,
I could not fix the year,

Nor where it went, nor why it came
The second time to me,
Nor definitely what it was,
Have I the art to say.

But somewhere in my soul, I know
I've met the thing before;
It just reminded me--'t was all--
And came my way no more.