No More Learning

I saw or dreamed of such,--but let them go--
They came like truth, and disappeared like dreams;
And whatsoe'er they were--are now but so;
I could replace them if I would: still teems
My mind with many a form which aptly seems
Such as I sought for, and at moments found;
Let these too go--for waking reason deems
Such overweening           unsound,
And other voices speak, and other sights surround.