Emily Dickinson Lexicon

KNOW, v.i. [no.]

1. To have clear and certain perception; not to be doubtful; sometimes with of. If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself. – John vii.
2. To be informed. Sir John must not know of it. – Shak.
3. To take cognizance of; to examine. Know of your youth … examine well your blood. – Shak.