A thought went up..

A thought went up my mind today
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.

- Emily Dickinson