It is. I will not swear that black is white,

But I suspect in fact that white is black,

And the whole matter rests upon eye-sight:—

Ask a blind man, the best judge. You'll attack

Perhaps this new position—but I'm right;

Or if I'm wrong, I'll not be ta'en aback:—

He hath no morn nor night, but all is dark

Within—and what seest thou? A dubious spark!