The Collaborative International Dictionary of English v.0.48:
Know \Know\, v. i.
1. To have knowledge; to have a clear and certain perception;
to possess wisdom, instruction, or information; -- often
Israel doth not know, my people doth not consider.
--Is. i. 3.
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.
The peasant folklore of Europe still knows of
willows that bleed and weep and speak when hewn.
2. To be assured; to feel confident.
To know of, to ask, to inquire. [Obs.] " Know of your
youth, examine well your blood." --Shak.