Our Lady Undoer of Knots & St. Wenceslaus

What does the title for Mary “Undoer of Knots” refer to? What is meant when Jesus says, on his way to the cross, not to weep for him but to weep for “yourselves and your children”? Why do Franciscans wear cords around their waist? Cale also looks at St. Wenceslaus on this his feast day.